Learning objective

Calculate power using energy transferred divided by time.

Read the explanation, check the common trap, then practise with flashcards and questions.

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Topic

Energy changes in a system, and the ways energy is stored before and after such changes

Subtopic

Power

AQA GCSE PhysicsEnergy

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Understand this objective

Short explanation

Power is defined as the rate at which energy is transferred or work is done. To calculate power, you can use the formula: power (P) = energy transferred (E) / time (t). This means that if you know the amount of energy transferred in joules and the time taken in seconds, you can determine the power in watts. For example, if 100 joules of energy is transferred in 5 seconds, the power would be 20 watts. Understanding this relationship helps in comparing the efficiency of different devices based on their power ratings.

Key concepts

PowerEnergy transfer rate

Why it matters

This objective helps connect Power to exam-style questions, flashcards, and revision notes for Energy changes in a system, and the ways energy is stored before and after such changes.

Common mistakes

1 linked

Common Mistake in Power Calculation: Remember that power can be calculated using the formula: power = energy transferred / time. Ensure you use energy transferred when calculating power.

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