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Cambridge AS & A Level Physics

9.2Potential difference and power

Potential difference and power in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic23 practice questions1 lesson

Learning objectives

What the syllabus expects you to be able to do.

  1. 9.2.1Define potential difference as energy transferred per unit charge.
  2. 9.2.2Recall and use V = W/Q.
  3. 9.2.3Recall and use the three forms of the electrical power equation.

Lessons

  • Potential difference and electrical power

    40 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Potential difference and power: sample question

1 mark

An immersion heater has a resistance of 20 Ω20\ \Omega and carries a current of 11 A11\ \text{A}. Calculate its power, in W.

Answer in W.

Turn Potential difference and power into a strength.

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