エネルギーって聞いたことあるよね？実は君たちが毎日やってること - スマホを充電したり、自転車をこいだり、ご飯を食べたりするのも、ぜんぶエネルギーが関わってるんだ。今回は、この目に見えないけど超重要な「エネルギー」について、わかりやすく学んでいこう！
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Updated Apr 14, 2026
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エネルギーの基本
1 / 4
エネルギーって何？基本をマスターしよう
君が朝起きて電気をつけたり、友達とサッカーをしたりできるのは、すべてエネルギーがあるから。エネルギーは「仕事をする能力」のことで、物を動かしたり、温めたり、光らせたりする力の源なんだ。
目には見えないけど、エネルギーは絶対になくならない。ただ形を変えるだけ。これをエネルギー保存の法則って呼ぶよ。
エネルギーの単位は**J（ジュール）**を使う。テストでよく出るから絶対覚えておこう！
💡 覚えておこう！ エネルギーは消えたり新しく生まれたりしない。ただ姿を変えているだけ！
エネルギーの種類を覚えよう
エネルギーには色んな種類がある。身の回りの例で覚えると簡単だよ！
運動エネルギーは動いてる物が持ってるエネルギー。電車やボール、風車が回ってるときのエネルギーだね。位置エネルギーは高いところにある物が持ってるエネルギーで、ダムの水や棚の上の本がそう。
熱エネルギーは温度に関係してて、ストーブやお風呂のお湯。光エネルギーは太陽や電球の明かり。電気エネルギーはコンセントの電気や雷のこと。
化学エネルギーは食べ物や石油の中にたくわえられてる。音エネルギーはスピーカーや太鼓の音。弾性エネルギーは伸ばしたゴムや縮めたバネが持ってるエネルギーだ。
📝 テストのコツ！ 運動エネルギー＋位置エネルギー＝力学的エネルギー。この組み合わせもよく出るよ！
エネルギーが変身する仕組み
エネルギーは一つの形から別の形にどんどん変わってる。これがエネルギー変換だ。
懐中電灯を例にすると、乾電池の化学エネルギーが電気エネルギーに変わって、豆電球で光エネルギーと熱エネルギーになる。つまり「化学→電気→光＋熱」って流れだね。
人が走るときは、朝ご飯の化学エネルギーが筋肉の運動エネルギーに変わって、同時に体温が上がるから熱エネルギーも出てる。「化学→運動＋熱」って感じ。
矢印（→）を使って流れを書けるように練習しておこう。テストでめちゃくちゃ出るから！
⚠️ 注意！ エネルギー変換では、必ず一部が熱として逃げてることを忘れずに。完璧な変換はないんだ。
テスト対策とまとめ
テストでよく出るポイントをチェックしよう。
「エネルギーとは何か」は「仕事をする能力」って答える。単位の**J（ジュール）**も書き忘れないように。エネルギー変換の問題では、矢印を使って「A→B→C」みたいに流れを書けばOK。
エネルギー保存の法則は超重要。高校でも使うから、今のうちに「エネルギーは形を変えるだけ」って覚えておこう。
身の回りの例をたくさん考えられるようになると、テストで楽勝だよ。植物の光合成は光エネルギーを化学エネルギーに変えてるし、君がゲームしてるときもいろんなエネルギー変換が起きてる。
君ならきっとできる！エネルギーの世界はめちゃくちゃ面白いから、楽しみながら学んでいこう。
🎯 最終チェック！ エネルギーの種類8つと変換の流れ、保存の法則。この3つができればテストは完璧！
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in 物理
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
エネルギーの基本
エネルギーって聞いたことあるよね？実は君たちが毎日やってること - スマホを充電したり、自転車をこいだり、ご飯を食べたりするのも、ぜんぶエネルギーが関わってるんだ。今回は、この目に見えないけど超重要な「エネルギー」について、わかりやすく学んでいこう！
エネルギーって何？基本をマスターしよう
君が朝起きて電気をつけたり、友達とサッカーをしたりできるのは、すべてエネルギーがあるから。エネルギーは「仕事をする能力」のことで、物を動かしたり、温めたり、光らせたりする力の源なんだ。
目には見えないけど、エネルギーは絶対になくならない。ただ形を変えるだけ。これをエネルギー保存の法則って呼ぶよ。
エネルギーの単位は**J（ジュール）**を使う。テストでよく出るから絶対覚えておこう！
💡 覚えておこう！ エネルギーは消えたり新しく生まれたりしない。ただ姿を変えているだけ！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
エネルギーの種類を覚えよう
エネルギーには色んな種類がある。身の回りの例で覚えると簡単だよ！
運動エネルギーは動いてる物が持ってるエネルギー。電車やボール、風車が回ってるときのエネルギーだね。位置エネルギーは高いところにある物が持ってるエネルギーで、ダムの水や棚の上の本がそう。
熱エネルギーは温度に関係してて、ストーブやお風呂のお湯。光エネルギーは太陽や電球の明かり。電気エネルギーはコンセントの電気や雷のこと。
化学エネルギーは食べ物や石油の中にたくわえられてる。音エネルギーはスピーカーや太鼓の音。弾性エネルギーは伸ばしたゴムや縮めたバネが持ってるエネルギーだ。
📝 テストのコツ！ 運動エネルギー＋位置エネルギー＝力学的エネルギー。この組み合わせもよく出るよ！
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
エネルギーが変身する仕組み
エネルギーは一つの形から別の形にどんどん変わってる。これがエネルギー変換だ。
懐中電灯を例にすると、乾電池の化学エネルギーが電気エネルギーに変わって、豆電球で光エネルギーと熱エネルギーになる。つまり「化学→電気→光＋熱」って流れだね。
人が走るときは、朝ご飯の化学エネルギーが筋肉の運動エネルギーに変わって、同時に体温が上がるから熱エネルギーも出てる。「化学→運動＋熱」って感じ。
矢印（→）を使って流れを書けるように練習しておこう。テストでめちゃくちゃ出るから！
⚠️ 注意！ エネルギー変換では、必ず一部が熱として逃げてることを忘れずに。完璧な変換はないんだ。
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
テスト対策とまとめ
テストでよく出るポイントをチェックしよう。
「エネルギーとは何か」は「仕事をする能力」って答える。単位の**J（ジュール）**も書き忘れないように。エネルギー変換の問題では、矢印を使って「A→B→C」みたいに流れを書けばOK。
エネルギー保存の法則は超重要。高校でも使うから、今のうちに「エネルギーは形を変えるだけ」って覚えておこう。
身の回りの例をたくさん考えられるようになると、テストで楽勝だよ。植物の光合成は光エネルギーを化学エネルギーに変えてるし、君がゲームしてるときもいろんなエネルギー変換が起きてる。
君ならきっとできる！エネルギーの世界はめちゃくちゃ面白いから、楽しみながら学んでいこう。
🎯 最終チェック！ エネルギーの種類8つと変換の流れ、保存の法則。この3つができればテストは完璧！
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Most popular content in 物理
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user