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It's Not Just How Much Energy — It's How Fast

Part of Power · GCSE GCSE Physics revision

This introduction covers It's Not Just How Much Energy — It's How Fast within Power for GCSE Physics. Revise Power in Energy for GCSE Physics with 14 exam-style questions and 25 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 1 of 12 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 12

Practice

14 questions

Recall

25 flashcards

⚡ It's Not Just How Much Energy — It's How Fast

A Ferrari and an electric milk float could both drive up the same hill, transferring the same total gravitational potential energy to get to the top. But the Ferrari does it in 10 seconds; the milk float takes 10 minutes. The difference is not the amount of energy — it is the rate at which energy is transferred. This is power. A 100 W light bulb transfers 100 joules every second. A 3,000 W kettle transfers 3,000 joules every second — 30 times faster. That is why your kettle boils water in 2 minutes while a faint torch bulb could never boil a cup of water at all, even if left running all day.

Keep building this topic

Read this section alongside the surrounding pages in Power. That gives you the full topic sequence instead of a single isolated revision point.

Understanding PowerPower Units and Typical ValuesWhy Power Matters in Electrical Circuits

Practice Questions for Power

Which of the following is the correct definition of power?

  • A. The total amount of energy stored in a system
  • B. The rate at which energy is transferred
  • C. The force applied multiplied by the distance moved
  • D. The amount of work that can be done in one hour
1 markfoundation

State what is meant by the term 'power' in physics and state its unit.

2 marksstandard

Quick Recall Flashcards

What is power?
Power is the rate at which energy is transferred or work is done. It is measured in watts (W).
What is mechanical power?
Mechanical power is the rate at which mechanical work is done or mechanical energy is transferred, calculated using P = W/t.

14 questions on Power — practise free

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