Last Updated Sep 26, 2025

Power Simplified Revision Notes for GCSE AQA Physics Combined Science

Revision notes with simplified explanations to understand Power quickly and effectively.

Learn about Energy Changes in a System for your GCSE Physics Combined Science Exam. This Revision Note includes a summary of Energy Changes in a System for easy recall in your Physics Combined Science exam

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1.1.10 Power

Power

infoNote

Power is defined as the rate at which energy is transferred or the rate at which work is done.

Formula

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Formula

$$\text{Power} = \frac{\text{energy transferred}}{\text{time}} = \frac{\text{work done}}{\text{time}} = P = \frac{E}{t} = \frac{W}{t}$$

Variables

• $P$: Power, in watts (W)
• $E$: Energy transferred, in joules (J)
• $t$: Time, in seconds (s)
• $W:$ Work done, in joules (J)

Explanation

• Power (P): Measured in watts (W), represents the rate of energy transfer or work done.
• Energy Transfer: 1 joule per second equals a power of 1 watt.
• Comparing Motors: If two motors, A and B, perform the same work, the motor that completes the work faster is more powerful because the energy is transferred at a faster rate.

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