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Cambridge AS & A Level Physics

10.3Potential dividers

Potential dividers in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 10.3.1Explain the principle of a potential divider.
  2. 10.3.2Use the potentiometer to compare potential differences.
  3. 10.3.3Explain the use of a galvanometer in null methods.
  4. 10.3.4Explain how thermistors and LDRs in potential dividers give temperature- or light-dependent outputs.

Lessons

  • Potential dividers and sensor circuits

    40 min

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  • The potentiometer and null methods

    40 min

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Sample question

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

Potential dividers: sample question

1 mark

An 8.2 kΩ8.2\ \text{k}\Omega resistor and a 3.3 kΩ3.3\ \text{k}\Omega resistor are connected in series across a 12 V12\ \text{V} supply of negligible internal resistance. What is the p.d. across the 3.3 kΩ3.3\ \text{k}\Omega resistor?

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