Yuk, kita pahami bersama mengenai konsep energi, meliputi pengertian, rumus, bentuk-bentuk energi disertai contoh, hingga perubahannya di dalam kehidupan sehari-hari di artikel Fisika kelas 7 ini!
—
Kamu pernah kan berolahraga, lalu jadi merasa lelah? Misalnya, lari atau bersepeda. Biasanya, kalo udah capek, hal paling mudah yang dapat kamu lakukan adalah beristirahat. Bisa dengan cara duduk, berdiri di depan kipas angin, atau mengonsumsi makanan dan minuman.
Hal ini perlu kamu lakukan, karena sudah kehabisan energi. Apa sih energi itu? Apa hubungannya lelah dengan energi, ya? Ayo, kita temukan jawabannya!
Seperti peralatan elektronik yang memakai baterai, jika peralatan tersebut kehabisan baterainya, maka alat itu tidak akan bisa bekerja dan mati. Selain itu, jika ada dua alat elektronik yang memiliki baterai berbeda.
Misalnya, yang satu dalam keadaan penuh, dan yang satunya dalam keadaan setengah penuh, maka alat yang memiliki kondisi baterai penuh akan bertahan dan bekerja lebih lama.
Pengertian Energi
Baterai dan kelelahan manusia sama-sama dipengaruhi oleh energi. Energi adalah kemampuan untuk melakukan usaha (kerja) dan mengalami perubahan.
Perubahan ini bisa berupa perubahan posisi, perubahan gerak, perubahan suhu, perubahan wujud zat, bahkan perubahan pada makhluk hidup, seperti tumbuh dan berkembang juga termasuk di dalamnya.
Jika energi habis, maka suatu benda itu tidak akan bisa melakukan kerja (usaha). Manusia bisa merasa kelelahan sehabis berkegiatan, karena manusia menggunakan energi. Maka, manusia beristirahat dan mengonsumsi makanan serta minuman untuk mengembalikan energi yang hilang.
Baca Juga: Macam-Macam Sifat dan Perubahan Bentuk Zat
Satuan Energi
Dalam satuan internasional (SI), satuan dari energi adalah joule. Selain itu, untuk menyatakan energi dalam bentuk kalor (panas) digunakan kalori dan kWh untuk menyatakan energi listrik.
Bentuk-Bentuk Energi
Alam menyediakan banyak sekali sumber energi yang dapat digunakan oleh manusia. Angin, air, cahaya, minyak bumi, bahkan bunyi pun memiliki energi. Berbagai jenis atau bentuk-bentuk energi yang bisa kamu ketahui, di antaranya sebagai berikut:
1. Energi Potensial
Energi potensial (EP) merupakan energi yang tersimpan pada sebuah benda atau sesuatu karena posisi atau kedudukannya. Energi potensial terbagi lagi menjadi beberapa macam, yaitu energi potensial gravitasi, energi potensial pegas (elastis), dan energi potensial listrik, dan masih banyak lagi.
Nah, contohnya itu apa, sih? Misalnya, kamu ingin menjatuhkan sebuah benda dengan ketinggian tertentu. Semakin tinggi kedudukan benda tersebut dari tanah/lantai, maka semakin besar pula energi potensialnya. Paham, ya?
Rumus Energi Potensial: Ep = m × g × h
Keterangan:
m = Massa benda (kg)
g = Gravitasi (N/kg)
h = Ketinggian letak benda dari bumi (m)
Baca Juga: Konsep Energi Kinetik, Mekanik & Potensial dalam Permainan Badminton
2. Energi Kinetik
Beda lagi dengan energi kinetik (EK), yang merupakan energi yang dimiliki sebuah benda bermassa akibat geraknya. Energi kinetik ini juga terbagi menjadi energi kinetik translasi dan energi kinetik rotasi. Waduh, bedanya apa tuh?
Jadi, kalau energi kinetik translasi ini, geraknya lurus, bisa maju, atau mundur. Contohnya kayak kamu yang sedang menarik atau mendorong benda, ya. Sementara itu, energi kinetik rotasi, gerakannya memutar, contohnya seperti gerakan pada permainan gangsing.
Rumus Energi Kinetik: Ek = 1/2 m × v²
Keterangan:
Ek= Energi kinetik (satuan Joule atau J)
m= Massa (satuan Kg)
v= Kecepatan (m/s)
3. Energi Mekanik
Jenis energi lainnya adalah energi mekanik (EM), yang merupakan jumlah energi potensial dan energi kinetik pada sebuah benda atau sistem. Maksudnya bagemana, sik? Kok, campuran gini! Hehehe… Kalem, boss!
Contohnya itu saat kamu sedang bermain ketapel, deh. Ketika batu kamu tarik ke belakang, batu tersebut memiliki energi potensial, tapi ketika batu itu kamu lepas dan terdorong ke depan, batu tersebut memiliki energi kinetik.
Rumus Energi Mekanik: Em = Ek + Ep = (1/2 m × v²) + (m × g × h)
Keterangan:
Em = Energi mekanik
Ek = Energi kinetik
Ep = Energi potensial
m = Massa (kg)
v = Kecepatan (m/s)
g = Percepatan gravitasi (m/s²)
h = Tinggi (m)
4. Energi Listrik dan Energi Potensial Listrik
Energi potensial listrik adalah usaha untuk memindahkan muatan dalam beda potensial listrik. Sementara itu, energi listrik adalah energi yang dihasilkan oleh arus listrik yang bekerja pada sebuah perangkat listrik.
Materi ini bakal kamu pelajari lebih lanjut pada topik kelistrikan di kelas 9 nanti, ya. Contoh energi listrik itu ada pada baterai atau aki.
Baca Juga: Bisakah Kita Memiliki Energi Listrik Seperti Electro?
5. Energi Panas (Termal)
Energi panas terbagi dua, yaitu energi panas yang tersimpan pada sebuah benda, dan energi panas yang dipindahkan ke benda lain (kalor).
Contoh energi panas yang paling besar dan penting adalah matahari. Energi matahari juga bisa membuat air menguap dan melakukan siklus untuk membuat hujan, serta masih banyak lainnya.
Selain matahari, bumi juga menyediakan energi panas yang bisa kita manfaatkan. Misalnya, panas bumi yang dapat digunakan sebagai pembangkit listrik tenaga panas bumi (geothermal).
6. Energi Kimia
Energi kimia merupakan energi yang terkandung dalam ikatan atom-atom penyusun sebuah materi. Energi kimia juga merupakan sumber energi yang dapat diolah oleh tubuh makhluk hidup. Contohnya pengolahan karbohidrat oleh enzim-enzim yang ada di tubuh kita.
7. Energi Nuklir
Manusia juga menciptakan sumber energi lain yang cukup berbahaya, yaitu melalui radioaktif dari uranium dan plutonium. Biasanya kita mengenal energi ini dengan nama energi nuklir.
Memang, energi nuklir dapat menghasilkan tenaga yang besar melalui reaksi inti baik reaksi fisi (pemisahan) maupun reaksi fusi (penggabungan), tetapi diperlukan tenaga ahli dan perlengkapan yang memadai untuk menstabilkan reaksinya sebelum bisa digunakan tenaganya. Karena jika salah penanganan maka uranium atau plutonium ini bisa meledak dengan sangat dahsyat!
8. Energi Cahaya
Sama seperti namanya, energi cahaya merupakan energi yang menghasilkan cahaya. Bukan cahaya ilahi tentunya, ya. Contohnya itu lampu, lilin, senter, bahkan matahari, selain merupakan sumber energi panas, juga menghasilkan cahaya. Cahaya pada matahari digunakan tumbuhan untuk melakukan fotosintesis dan menghasilkan oksigen untuk menopang kehidupan.
9. Energi Bunyi
Terakhir, energi bunyi yang menghasilkan sumber bunyi. Coba, menurut kamu, contoh energi bunyi itu ada apa aja? Tulis jawabanmu di kolom komentar, yah!
Baca Juga: Belajar Jenis-Jenis Bunyi dari Sekelompok Jerapah
Perubahan Energi
Sebenernya, energi yang kita gunakan itu berasal dari bentuk energi lain yang kita olah dan konversi menjadi bentuk energi yang kita inginkan. Hal ini dinyatakan dalam hukum kekekalan energi. Kurang lebih bunyinya seperti ini, ya:
Hukum Kekekalan Energi
Coba perhatikan pada kalimat energi dapat berubah ke bentuk energi lain. Perubahan energi ini bisa kita sebut sebagai konversi energi atau transformasi energi.
Misalnya, kita ingin menggunakan sepeda motor, itu berarti kita mengubah bentuk energi kimia dari bahan bakar minyak, menjadi kalor pada mesin, dan menjadi energi kinetik, sehingga motor bisa bergerak.
Contoh Perubahan Energi
Contoh perubahan energi lainnya, bisa kamu lihat pada gambar di bawah ini.
Fungsi Energi
Fungsi energi membantu makhluk hidup untuk beraktivitas. Manusia menggunakan energi untuk mempertahankan kelangsungan hidup. Alam menyediakan banyak energi yang dapat dimanfaatkan oleh manusia, misalnya energi panas matahari, gelombang laut, dan masih banyak lagi.
—
Kesimpulannya, baik makhluk hidup maupun benda-benda sekitar kita, dapat melakukan kerja apabila mempunyai energi yang cukup. Nah, energi tersebut didapatkan dari sumber energi. Makanan yang kita makan, baterai, dan bahan bakar merupakan contoh sumber energi.
Gimana, guys, sudah paham kan mengenai konsep energi, bentuk-bentuk, fungsi, sampai perubahannya? Nah, untuk mengetahui lebih lanjut tentang energi, kamu bisa lihat video penjelasannya di ruangbelajar, selain itu di sana ada juga video tentang materi lain yang tentunya menarik dan mudah di mengerti, ayo coba!
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<h1 class="content-title">
Pengertian Energi, Bentuk-Bentuk, Contoh & Perubahannya | Fisika Kelas 7 </h1>
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<p class="content-author"><a href="https://www.ruangguru.com/blog/author/hani-ammariah" class="">Hani Ammariah</a> </p>
<p class="content-info"><span>October 30, 2024 • </span> <span>6 minutes read</span></p>
<br />
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<p style="text-align: justify;"><span style="color: #000000;"><img decoding="async" style="width: 820px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Energi%20dan%20Perubahannya%20-%20Fisika%20Kelas%207-02.jpg" alt="Energi dan Perubahannya" /></span></p>
<blockquote>
<p style="text-align: center;"><em>Yuk, kita pahami bersama mengenai <strong>konsep energi</strong>, meliputi pengertian, rumus, bentuk-bentuk energi disertai contoh, hingga perubahannya di dalam kehidupan sehari-hari di <strong><a href="https://www.ruangguru.com/blog/c/fisika/fisika-smp-kelas-7">artikel Fisika kelas 7</a></strong> ini!</em></p>
</blockquote>
<p style="text-align: center;"><span style="color: #000000;">—</span></p>
<p> </p>
<p style="text-align: justify;"><span style="font-weight: 400;">Kamu pernah kan </span><strong><a href="https://www.ruangguru.com/blog/olahraga-pagi-vs-sore-hari">berolahraga</a></strong><span style="font-weight: 400;">, lalu jadi merasa lelah? Misalnya, lari atau bersepeda. Biasanya, kalo udah capek, hal paling mudah yang dapat kamu lakukan adalah beristirahat. Bisa dengan cara duduk, berdiri di depan kipas angin, atau mengonsumsi makanan dan minuman.</span></p>
<p style="text-align: justify;"><span style="font-weight: 400;">Hal ini perlu kamu lakukan, karena sudah kehabisan energi. Apa </span><i><span style="font-weight: 400;">sih</span></i><span style="font-weight: 400;"> energi itu? Apa hubungannya lelah dengan energi, ya? Ayo, kita temukan jawabannya!</span></p>
<p style="text-align: justify;"><span style="font-weight: 400;">Seperti peralatan elektronik yang memakai baterai, jika peralatan tersebut kehabisan baterainya, maka alat itu tidak akan bisa bekerja dan mati. Selain itu, jika ada dua alat elektronik yang memiliki baterai berbeda.</span></p>
<p style="text-align: justify;"><span style="font-weight: 400;">Misalnya, yang satu dalam keadaan penuh, dan yang satunya dalam keadaan setengah penuh, maka alat yang memiliki kondisi baterai penuh akan bertahan dan bekerja lebih lama.</span></p>
<p> </p>
<h2><span style="font-size: 18pt;">Pengertian Energi</span></h2>
<p style="text-align: justify;"><span style="font-weight: 400;">Baterai dan kelelahan manusia sama-sama dipengaruhi oleh energi. </span><strong><a href="https://www.ruangguru.com/blog/tahukah-kamu-asal-terjadinya-energi">Energi</a> adalah kemampuan untuk melakukan usaha (kerja) dan mengalami perubahan.</strong></p>
<p style="text-align: justify;"><span style="font-weight: 400;">Perubahan ini bisa berupa perubahan posisi, perubahan gerak, perubahan suhu, perubahan wujud zat, bahkan perubahan pada makhluk hidup, seperti tumbuh dan berkembang juga termasuk di dalamnya.</span></p>
<p style="text-align: justify;"><span style="font-weight: 400;">Jika energi habis, maka suatu benda itu tidak akan bisa melakukan kerja (usaha). Manusia bisa merasa kelelahan sehabis berkegiatan, karena manusia menggunakan energi. Maka, manusia beristirahat dan mengonsumsi makanan serta minuman untuk mengembalikan energi yang hilang.</span></p>
<p><strong>Baca Juga: <a href="https://www.ruangguru.com/blog/sifat-dan-perubahan-bentuk-zat">Macam-Macam Sifat dan Perubahan Bentuk Zat</a></strong></p>
<p> </p>
<h2><span style="font-size: 18pt;">Satuan Energi</span></h2>
<p style="text-align: justify;">Dalam satuan internasional (SI), <strong>satuan dari energi adalah joule</strong>. Selain itu, untuk menyatakan energi dalam bentuk kalor (panas) digunakan kalori dan kWh untuk menyatakan energi listrik.</p>
<p style="text-align: justify;"><span style="color: #000000;"><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Energi%20dan%20Perubahannya%20-%20Fisika%20Kelas%207-03.jpg" alt="satuan energi" width="600" /></span></p>
<p> </p>
<h2><span style="font-size: 18pt;">Bentuk-Bentuk Energi</span></h2>
<p style="text-align: justify;"><span style="font-weight: 400;">Alam menyediakan banyak sekali sumber energi yang dapat digunakan oleh manusia. Angin, air, cahaya, minyak bumi, bahkan bunyi pun memiliki energi. Berbagai jenis atau bentuk-bentuk energi yang bisa kamu ketahui, di antaranya sebagai berikut:</span></p>
<p style="text-align: justify;"><span style="color: #000000;"><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Energi%20dan%20Perubahannya%20-%20Fisika%20Kelas%207-04.jpg" alt="bentuk-bentuk energi" width="600" /></span></p>
<p> </p>
<h3><span style="font-size: 14pt;">1. Energi Potensial</span></h3>
<p style="text-align: justify;"><span style="font-weight: 400;">Energi potensial (EP) merupakan </span><strong>energi yang tersimpan pada sebuah benda atau sesuatu karena posisi atau kedudukannya</strong><span style="font-weight: 400;">. Energi potensial terbagi lagi menjadi beberapa macam, yaitu energi potensial gravitasi, energi potensial pegas (elastis), dan energi potensial listrik, dan masih banyak lagi. </span></p>
<p style="text-align: justify;"><span style="font-weight: 400;">Nah, contohnya itu apa, sih? Misalnya, kamu ingin menjatuhkan sebuah benda dengan ketinggian tertentu. Semakin tinggi kedudukan benda tersebut dari tanah/lantai, maka semakin besar pula energi potensialnya. Paham, ya? </span></p>
<blockquote>
<p style="text-align: center;"><span style="font-size: 14pt;"><strong>Rumus Energi Potensial: Ep = m × g × h</strong></span></p>
</blockquote>
<p><strong>Keterangan:</strong></p>
<p><span style="font-weight: 400;">m = Massa benda (kg)</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">g = Gravitasi (N/kg)</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">h = Ketinggian letak benda dari bumi (m)</span></p>
<p><strong>Baca Juga:<a href="https://www.ruangguru.com/blog/konsep-energi-kinetik-potensial-dan-mekanik"> Konsep Energi Kinetik, Mekanik & Potensial dalam Permainan Badminton</a> </strong></p>
<p> </p>
<h3><span style="font-size: 14pt;">2. Energi Kinetik</span></h3>
<p style="text-align: justify;"><span style="font-weight: 400;">Beda lagi dengan energi kinetik (EK), yang merupakan </span><strong>energi yang dimiliki sebuah benda bermassa akibat geraknya</strong><span style="font-weight: 400;">. Energi kinetik ini juga terbagi menjadi energi kinetik translasi dan energi kinetik rotasi. Waduh, bedanya apa tuh?</span></p>
<p style="text-align: justify;"><span style="font-weight: 400;">Jadi, kalau energi kinetik translasi ini, geraknya lurus, bisa maju, atau mundur. Contohnya kayak kamu yang sedang menarik atau mendorong benda, ya. Sementara itu, energi kinetik rotasi, gerakannya memutar, contohnya seperti gerakan pada permainan gangsing. </span></p>
<blockquote>
<p style="text-align: center;"><span style="font-size: 14pt;"><strong>Rumus Energi Kinetik: Ek = 1/2 m × v²</strong></span></p>
</blockquote>
<p><strong>Keterangan:</strong></p>
<p style="text-align: justify;"><span style="color: #000000;"><span style="font-weight: 400;">Ek= Energi kinetik (satuan Joule atau J)</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">m= Massa (satuan Kg)</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">v= Kecepatan (m/s)</span> </span></p>
<p> </p>
<h3><span style="font-size: 14pt;">3. Energi Mekanik</span></h3>
<p style="text-align: justify;">Jenis energi lainnya adalah energi mekanik (EM), yang merupakan <strong>jumlah energi potensial dan energi kinetik pada sebuah benda atau sistem</strong>. Maksudnya bagemana, sik? Kok, campuran gini! Hehehe… Kalem, boss!</p>
<p style="text-align: justify;">Contohnya itu saat kamu sedang bermain ketapel, deh. Ketika batu kamu tarik ke belakang, batu tersebut memiliki energi potensial, tapi ketika batu itu kamu lepas dan terdorong ke depan, batu tersebut memiliki energi kinetik.</p>
<blockquote>
<p style="text-align: center;"><span style="font-size: 14pt;"><strong>Rumus Energi Mekanik: Em = Ek + Ep = (1/2 m × v²) + (m × g × h)</strong></span></p>
</blockquote>
<p><strong>Keterangan:</strong></p>
<p><span style="font-weight: 400;">Em = Energi mekanik</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">Ek = Energi kinetik</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">Ep = Energi potensial</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">m = Massa (kg)</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">v = Kecepatan (m/s)</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">g = Percepatan gravitasi (m/s²)</span><span style="font-weight: 400;"><br />
</span><span style="font-weight: 400;">h = Tinggi (m)</span></p>
<p> </p>
<h3><span style="font-size: 14pt;">4. Energi Listrik dan Energi Potensial Listrik</span></h3>
<p style="text-align: justify;"><strong>Energi potensial listrik adalah usaha untuk memindahkan muatan dalam beda potensial listrik</strong>. Sementara itu, <strong>energi listrik adalah energi yang dihasilkan oleh arus listrik</strong> yang bekerja pada sebuah perangkat listrik.</p>
<p style="text-align: justify;">Materi ini bakal kamu pelajari lebih lanjut pada topik <strong><a href="/blog/ipa-kelas-9-penerapan-listrik-dinamis-di-sekitar-kita" rel="noopener">kelistrikan</a> </strong>di kelas 9 nanti, ya. Contoh energi listrik itu ada pada baterai atau aki.</p>
<p><strong>Baca Juga:<a href="https://www.ruangguru.com/blog/ipa-kelas-9-bisakah-kita-memiliki-energi-listrik-seperti-electro"> Bisakah Kita Memiliki Energi Listrik Seperti Electro?</a></strong></p>
<p> </p>
<h3><span style="font-size: 14pt;">5. Energi Panas (Termal)</span></h3>
<p style="text-align: justify;">Energi panas terbagi dua, yaitu <strong>energi panas yang tersimpan pada sebuah benda</strong>, dan <strong>energi panas yang dipindahkan ke benda lain (kalor)</strong>.</p>
<p style="text-align: justify;">Contoh energi panas yang paling besar dan penting adalah matahari. Energi matahari juga bisa membuat air menguap dan melakukan siklus untuk membuat hujan, serta masih banyak lainnya.</p>
<p style="text-align: justify;">Selain matahari, bumi juga menyediakan energi panas yang bisa kita manfaatkan. Misalnya, panas bumi yang dapat digunakan sebagai pembangkit listrik tenaga panas bumi (geothermal).</p>
<h3><span style="font-size: 14pt;">6. Energi Kimia</span></h3>
<p style="text-align: justify;">Energi kimia merupakan <strong>energi yang terkandung dalam ikatan atom-atom penyusun sebuah materi</strong>. Energi kimia juga merupakan sumber energi yang dapat diolah oleh tubuh makhluk hidup. Contohnya pengolahan karbohidrat oleh enzim-enzim yang ada di tubuh kita.</p>
<p> </p>
<h3><span style="font-size: 14pt;">7. Energi Nuklir</span></h3>
<p style="text-align: justify;">Manusia juga menciptakan sumber energi lain yang cukup berbahaya, yaitu melalui radioaktif dari uranium dan plutonium. Biasanya kita mengenal energi ini dengan nama energi nuklir.</p>
<p style="text-align: justify;">Memang, energi nuklir dapat menghasilkan tenaga yang besar melalui <strong>reaksi inti baik reaksi fisi (pemisahan) maupun reaksi fusi (penggabungan)</strong>, tetapi diperlukan tenaga ahli dan perlengkapan yang memadai untuk menstabilkan reaksinya sebelum bisa digunakan tenaganya. Karena jika salah penanganan maka uranium atau plutonium ini bisa meledak dengan sangat dahsyat!</p>
<p> </p>
<h3><span style="font-size: 14pt;">8. Energi Cahaya</span></h3>
<p style="text-align: justify;">Sama seperti namanya, energi cahaya merupakan <strong>energi yang menghasilkan cahaya</strong>. Bukan cahaya ilahi tentunya, ya. Contohnya itu lampu, lilin, senter, bahkan matahari, selain merupakan sumber energi panas, juga menghasilkan cahaya. Cahaya pada matahari digunakan tumbuhan untuk melakukan fotosintesis dan menghasilkan oksigen untuk menopang kehidupan.</p>
<p> </p>
<h3><span style="font-size: 14pt;">9. Energi Bunyi</span></h3>
<p style="text-align: justify;">Terakhir, energi bunyi yang <strong>menghasilkan sumber bunyi</strong>. Coba, menurut kamu, contoh energi bunyi itu ada apa aja? Tulis jawabanmu di kolom komentar, yah!</p>
<p><strong>Baca Juga: <a href="https://www.ruangguru.com/blog/belajar-jenis-jenis-bunyi">Belajar Jenis-Jenis Bunyi dari Sekelompok Jerapah</a></strong></p>
<p> </p>
<h2><span style="font-size: 18pt;">Perubahan Energi</span></h2>
<p style="text-align: justify;">Sebenernya, energi yang kita gunakan itu berasal dari bentuk energi lain yang kita olah dan konversi menjadi bentuk energi yang kita inginkan. Hal ini dinyatakan dalam<strong> hukum kekekalan energi</strong><span style="font-weight: normal;">.</span> Kurang lebih bunyinya seperti ini, ya:</p>
<p> </p>
<h3><span style="font-size: 14pt;">Hukum Kekekalan Energi</span></h3>
<p style="text-align: justify;"><span style="color: #000000;"><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Energi%20dan%20Perubahannya%20-%20Fisika%20Kelas%207-11.jpg" alt="hukum kekekalan energi" width="600" /></span></p>
<p> </p>
<p style="text-align: justify;">Coba perhatikan pada kalimat energi dapat berubah ke bentuk energi lain. Perubahan energi ini bisa kita sebut sebagai<strong> konversi energi atau transformasi energi. </strong></p>
<p style="text-align: justify;"><span style="font-weight: normal;">M</span>isalnya, kita ingin menggunakan sepeda motor, itu berarti kita mengubah bentuk energi kimia dari bahan bakar minyak, menjadi kalor pada mesin, dan menjadi energi kinetik, sehingga motor bisa bergerak.</p>
<p> </p>
<h3><span style="font-size: 14pt;">Contoh Perubahan Energi</span></h3>
<p style="text-align: justify;">Contoh perubahan energi lainnya, bisa kamu lihat pada gambar di bawah ini.</p>
<p style="text-align: justify;"><img decoding="async" style="width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Energi%20dan%20Perubahannya%20-%20Fisika%20Kelas%207-12.jpg" alt="contoh perubahan energi" width="600" /></p>
<p> </p>
<h2><span style="font-size: 18pt;">Fungsi Energi</span></h2>
<p style="text-align: justify;">Fungsi energi <strong>membantu makhluk hidup untuk beraktivitas</strong>. Manusia menggunakan energi untuk mempertahankan kelangsungan hidup. Alam menyediakan banyak energi yang dapat dimanfaatkan oleh manusia, misalnya energi panas matahari, gelombang laut, dan masih banyak lagi.</p>
<p style="text-align: center;">—</p>
<p style="text-align: justify;">Kesimpulannya, baik makhluk hidup maupun benda-benda sekitar kita, dapat melakukan kerja apabila mempunyai energi yang cukup. Nah, energi tersebut didapatkan dari sumber energi. Makanan yang kita makan, baterai, dan bahan bakar merupakan contoh sumber energi.</p>
<p style="text-align: justify;">Gimana, guys, sudah paham kan mengenai konsep energi, bentuk-bentuk, fungsi, sampai perubahannya? Nah, untuk mengetahui lebih lanjut tentang energi, kamu bisa lihat video penjelasannya di <strong><a href="https://ruangguru.onelink.me/blPk/eaff0eb9" target="_blank" rel="noopener">ruangbelajar</a></strong>, selain itu di sana ada juga video tentang materi lain yang tentunya menarik dan mudah di mengerti, ayo coba!</p>
<p style="text-align: center;"><span style="color: #000000;"><a class="rg-cta" style="text-align: center;" href="https://link.ruangguru.com/blPk/eaff0eb9" target="_blank" rel="noopener"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/cta/0ec4a2df-db2e-4ae1-8473-692756dcb684.jpeg" alt="IDN CTA Blog ruangbelajar Ruangguru" /></a></span></p>
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<div class="d-lg-none text-center">
<nav class="footer-menu social">
<p class="title">Ikuti Kami</p>
<a target="_blank" href="https://www.instagram.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/instagram.png" loading="lazy" alt="Logo Instagram Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.facebook.com/ruanggurucom/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/facebook.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/facebook.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/facebook.png" loading="lazy" alt="Logo Facebook Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://twitter.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/twitter.png" loading=" lazy" alt="Logo Twitter Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.youtube.com/ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/youtube.png?height=60&convert=webp" type="image/webp">
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<img src="https://cdn-web-2.ruangguru.com/static/youtube.png" loading=" lazy" alt="Logo Youtube Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.linkedin.com/company/ruangguru-com">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/linkedin.png" loading=" lazy" alt="Logo LinkedIn Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.tiktok.com/@ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/tiktok.png?height=60&convert=webp" type="image/webp">
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<img src="https://cdn-web-2.ruangguru.com/static/tiktok.png" loading=" lazy" alt="Logo TikTok Footer" width="32px" height="32px" />
</picture>
</a>
</nav>
</div>
<p class="footer-copyright">
© 2026 All Rights Reserved PT. Ruang Raya Indonesia
</p>
</div>
<style>
.bantuan-container {
position: relative;
}
.bantuan-element {
position: fixed;
z-index: 999;
display: flex;
align-items: flex-end;
justify-content: flex-end;
cursor: pointer;
transition: all 0.6s ease;
}
.bantuan-top {
bottom: 11rem;
right: 2rem;
}
.bantuan-bottom {
bottom: 2rem;
right: 2rem;
}
.bantuan-top-2 {
bottom: 15rem;
right: 2rem;
}
.bantuan-top-3 {
bottom: 19rem;
right: 2rem;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 2rem;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 2rem;
}
@media (min-width: 768px) {
.bantuan-element img {
width: auto;
transition: all 0.4s ease;
}
.bantuan-top img {
width: 140px;
}
.bantuan-bottom img {
width: 140px;
}
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 140px;
}
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 140px;
}
.bantuan-element.clicked {
bottom: 9rem;
right: 2.5rem;
}
.bantuan-element.clicked img {
width: auto;
height: 64px;
}
}
@media (max-width: 767px) {
.bantuan-top {
bottom: 8rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom {
bottom: 2rem;
right: 1.25rem;
align-items: center;
}
.bantuan-top-2 {
bottom: 12rem;
right: 1rem;
align-items: center;
}
.bantuan-top-3 {
bottom: 16rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 1.25rem;
align-items: center;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 1.25rem;
align-items: center;
}
.bantuan-element img {
width: auto;
}
.bantuan-top img,
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 96px;
}
.bantuan-bottom img,
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 96px;
}
}
.bantuan-element:hover {
transform: scale(1.05);
}
.bantuan-element img {
max-width: 100%;
height: auto;
}
</style>
<div id="bantuan-divs-container" style="position: relative" data-product="ruangguru" data-table="rg_floating_icon"></div>
<script>
class FloatingDivsComponent {
constructor(product = 'ruangguru', table = 'rg_floating_icon') {
this.container = document.getElementById('bantuan-divs-container');
this.floatingElements = [];
this.product = product;
this.table = table;
// Configuration
this.config = {
baseApiUrl: 'https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/rg_banner/views/',
apiKey: 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
maxElements: 2,
zIndexBase: 100,
};
// Build dynamic API URL based on table parameter
this.config.apiUrl = this.buildApiUrl();
this.init();
}
buildApiUrl() {
const baseUrl = this.config.baseApiUrl;
const tableName = this.table || 'rg_floating_icon';
const queryParams =
'offset=0&limit=99999&sort=rankPosition&where=(type,eq,floating)~and(showIn,anyof,blog)~and(hide,is,false)~and(product,eq,' +
this.product +
')&nested%5Bcta%5D%5Bfields%5D=Id,name,ctaId,imageUrl,ctaLink,targetUrl';
return `${baseUrl}${tableName}?${queryParams}`;
}
async init() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to initialize floating divs component:', error);
}
}
async fetchFloatingElements() {
try {
const options = {
method: 'GET',
headers: {
'xc-token': this.config.apiKey || 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
},
};
const urlNoco = this.config.apiUrl;
const response = await fetch(urlNoco, options);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
this.floatingElements = this.processApiResponse(data);
} catch (error) {
console.error('Error fetching floating elements:', error);
throw error;
}
}
processApiResponse(data) {
if (!data || !data.list || !Array.isArray(data.list)) {
return [];
}
console.log(data.list);
// Ensure we only get maximum 2 elements
const limitedElements = data.list.slice(0, this.config.maxElements);
return limitedElements;
}
renderFloatingElements() {
if (!this.container || this.floatingElements.length === 0) {
return;
}
// Additional safeguard: ensure we never render more than maxElements
const elementsToRender = this.floatingElements.slice(0, this.config.maxElements);
// Clean up existing elements and their event listeners
this.cleanupExistingElements();
// Clear existing content
this.container.innerHTML = '';
elementsToRender.forEach((element, index) => {
const floatingDiv = this.createFloatingDiv(element, index);
this.container.appendChild(floatingDiv);
});
}
cleanupExistingElements() {
// Clear existing elements (no need for event listener cleanup with CSS approach)
const existingElements = this.container.querySelectorAll('[data-floating-element]');
existingElements.forEach(element => {
element.remove();
});
}
createFloatingDiv(element, index) {
const div = document.createElement('div');
const cta = element.cta[0]; // Use the first CTA
// Add data attribute for cleanup tracking
div.setAttribute('data-floating-element', 'true');
// Apply CSS classes based on rankPosition
const positionClass = this.getPositionClass(element.rankPosition, index);
div.className = `bantuan-element ${positionClass}`;
div.style.zIndex = this.config.zIndexBase + index;
// Create the link and image
const link = document.createElement('a');
link.href = 'https://cta.ruangguru.com/' + cta.ctaId || '#';
link.target = '_blank';
// Add tracking attributes
link.setAttribute('data-tracking-event-type', 'landing_page__core__item_click');
link.setAttribute(
'data-tracking-context',
JSON.stringify({
product_name: this.product,
cta_action: 'redirection',
cta_action_detail: link.href,
item_type: 'floating',
item_name: element.name || 'Floating element',
item_category: 'payment',
item_position: index,
item_serial: null,
section_type: 'floating_item',
section_position: 'body',
section_name: 'floating_item',
})
);
const img = document.createElement('img');
img.src = element.imageUrl + '?h=200&convert=webp';
img.alt = element.name || 'Floating element';
img.loading = 'lazy';
// Add click tracking
link.addEventListener('click', () => {
this.trackClick(element, cta);
});
link.appendChild(img);
div.appendChild(link);
return div;
}
getPositionClass(rankPosition, index) {
// Define positioning classes based on rankPosition
if (rankPosition === 1) {
return 'bantuan-top'; // Top position
} else if (rankPosition === 2) {
return 'bantuan-bottom'; // Bottom position
} else {
// For additional elements, distribute them evenly
return `bantuan-${index % 2 === 0 ? 'top' : 'bottom'}-${Math.floor(index / 2) + 1}`;
}
}
trackClick(element, cta) {
// Implement click tracking logic here
console.log('Floating element clicked:', {
elementId: element.Id,
elementName: cta.name,
ctaId: cta.ctaId,
targetUrl: cta.targetUrl,
});
}
// Public method to manually refresh
async refresh() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to refresh floating elements:', error);
throw error;
}
}
// Public method to get current floating elements
getFloatingElements() {
return [...this.floatingElements];
}
}
// Initialize the component when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
// Get product and table parameters from data attributes
const container = document.getElementById('bantuan-divs-container');
const product = container.getAttribute('data-product') || 'ruangguru';
const table = container.getAttribute('data-table') || 'rg_floating_icon';
new FloatingDivsComponent(product, table);
});
// Export for use in other modules if needed
if (typeof module !== 'undefined' && module.exports) {
module.exports = FloatingDivsComponent;
}
</script> <div id="wp-install-nudge" style="
position: fixed;
bottom: 0rem;
right: 0;
z-index: 999;
cursor: pointer;
"></div>
<script>
(function (w, d, s, o, f, js, fjs) {
w['Sales-Nudge-Widget'] = o; w[o] = w[o] || function () { (w[o].q = w[o].q || []).push(arguments) };
js = d.createElement(s), fjs = d.getElementsByTagName(s)[0];
js.id = o; js.src = f; js.async = 1; fjs.parentNode.insertBefore(js, fjs);
}(window, document, 'script', 'wpInstallNudge', 'https://cdn-web-2.ruangguru.com/sales-nudge/6198a95130/dist/widget.js'));
wpInstallNudge('init', { targetElementId: 'wp-install-nudge', clientTarget: 'ruangguru_blog' });
</script>
<script>
// note: disabled due to auto reload page
// var lastScrollTop = 0;
// $(window).scroll(function(event){
// var st = $(this).scrollTop();
// if (st > lastScrollTop){
// $('#wp-install-nudge').slideDown( "slow", function() {});
// } else {
// $('#wp-install-nudge').slideUp( "slow", function() {});
// }
// lastScrollTop = st;
// });
// $(document).ready(function () {
// $("#wp-install-nudge").hide();
// });
$('#wp-install-nudge').click(function(){
Analytics.track("promotion__install_nudge__click",
{
user_email: "ruangguru@blog.com",
cta_link: widgetData.dataConfig.target_link
}).catch((err) => {
console.log("tracker error", err);
});
});
</script>
</footer>
<div id="__next"></div>
<script type="speculationrules">
{"prefetch":[{"source":"document","where":{"and":[{"href_matches":"\/blog\/*"},{"not":{"href_matches":["\/blog\/wp-*.php","\/blog\/wp-admin\/*","\/blog\/wp-content\/uploads\/*","\/blog\/wp-content\/*","\/blog\/wp-content\/plugins\/*","\/blog\/wp-content\/themes\/ruangguru\/*","\/blog\/*\\?(.+)"]}},{"not":{"selector_matches":"a[rel~=\"nofollow\"]"}},{"not":{"selector_matches":".no-prefetch, .no-prefetch a"}}]},"eagerness":"conservative"}]}
</script>
<script>
async function getCtaDetails(ctaIds) {
const endpoint =
" https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/CTA/views/CTA?offset=0&limit=10&where=(ctaId,in," + ctaIds.toString() + ")";
try {
const response = await fetch(endpoint, {
headers: {
"xc-token": "-hG2nBDJzSj0agSgNtcJx97M4F02y54nUMoY6plJ",
},
});
const data = await response.json();
const ctaList = data?.list || [];
const ctaMap = new Map();
for (const ctaData of ctaList) {
ctaMap.set(ctaData.ctaId, ctaData);
}
return ctaMap;
} catch (error) {
console.error("Error fetching CTA details:", error);
return new Map();
}
}
async function replaceCTA() {
const regex = /{{cta\((‘(.*?)’|“(.*?)”)\)}}/g;
const bodyHTML = document.body.innerHTML;
const matches = Array.from(bodyHTML.matchAll(regex));
const ctaIds = matches.map((match) => {
let ctaId = match[2] ?? match[3];
return ctaId;
});
const ctaMap = await getCtaDetails(ctaIds);
const replacedHTML = bodyHTML.replace(regex, (match, _inner, ctaId1, ctaId2) => {
const ctaId = ctaId1 ?? ctaId2;
const ctaData = ctaMap.get(ctaId);
if (ctaData) {
return `<a href="https://cta.ruangguru.com/${ctaData.ctaId}" target="_${ctaData.targetType}" style="position:relative;display:inline-block;">
<img src="${ctaData.imageUrl}" loading="lazy" alt="${ctaData.altText}" />
</a>`;
} else {
return match;
}
});
document.body.innerHTML = replacedHTML;
}
</script>
<meta name="author" content="Ruangguru Tech Team">
<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-PVNLZFT" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- Tracker -->
<script type="text/javascript" src="https://cdn-web-2.ruangguru.com/landing-page-web/public/staticpages/global-assets/js/cta.js"></script>
<script src="https://unpkg.com/@dotlottie/player-component@latest/dist/dotlottie-player.mjs" type="module"></script>
</body>
</html>