Energy & Its Dissipation
Energy stores and transfers, and why energy always seems to run out.
What this lesson covers
Energy & Its Dissipation is a 10-part Class 7 Science lesson. Each part makes one point and then hands over to the next, so it can be read in a sitting or picked up again at the part you stopped on. It defines the idea in plain words before using it, works through an example step by step, breaks the topic into its parts and compares them, shows where it is used outside the textbook, names the mistakes that cost marks in an exam, ends with a recap of what to remember.
How it begins
Energy is stored in different ways: kinetic (movement), gravitational (height), chemical (food, fuel, batteries), thermal (hot objects), elastic (stretched things). Energy is measured in joules (J).
The 10 parts
- Energy stores
- Transfers between stores
- Useful and wasted energy
- What dissipation means
- Efficiency
- Reducing waste
- Sankey diagrams
- Where marks go
- What to remember
- Watch one worked through
Practise Energy & Its Dissipation
Everything on QuizByt for Class 7 Science that goes with this lesson: read it first, then test yourself while it is fresh.
🧠 5 quizzes on Energy & Its Dissipation (2 easy, 2 medium, 1 hard)
Work up from easy to hard: the hard quiz asks the Class 7 exam-style questions on Energy & Its Dissipation.
🖨️ Printable worksheet
Energy & Its Dissipation on paper for Class 7, with room to write the working out. Preview the first page free.
🎮 Games for Class 7 Science
Memory and reasoning games at the right level for Class 7. Passing a quiz on Energy & Its Dissipation earns the credits that open them.
This topic needs a subscription
This lesson is part of a paid plan. Create a free account to start with our free lessons, or subscribe to open every topic.
- 🆓 Free lessons are open on any account
- 📗 Monthly: 5 paid topics a month
- 📘 Yearly: 7 paid topics a month
- ⭐ Premium, every topic, unlimited
- 🧺 Or buy this single topic, the lesson is included