How It Works: Energy Dissipation and Closed Systems
Part of Energy Stores & Systems — GCSE Physics
This how it works covers How It Works: Energy Dissipation and Closed Systems within Energy Stores & Systems for GCSE Physics. Revise Energy Stores & Systems in Energy for GCSE Physics with 14 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 13 of 20 in this topic. Use this how it works to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 13 of 20
Practice
14 questions
Recall
30 flashcards
⚙️ How It Works: Energy Dissipation and Closed Systems
When physicists say energy is "wasted", they mean it has been transferred to a store that is not useful for the intended purpose — almost always the thermal store of the surroundings. This process is called dissipation.
A closed system is one where no energy can enter or leave. In a closed system, the total energy stored always remains constant. Real systems are never perfectly closed — some energy always escapes as heat. But we can minimise this with insulation, lubrication, and streamlining.
The concept of a system is important: you define the boundary of your system, and then track all energy entering and leaving across that boundary. If the total doesn't balance, you've missed something!