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1 markElectrical Circuits

CAPE Physics Unit 2 · 2004 · Paper 2 · Question 1(a)(i)

An experiment to determine the electromotive force (e.m.f.), E, and internal resistance, r, of a battery using a voltmeter V and variable resistor R connected as in Figure 1a.

Identify the problem affecting the circuit in Figure 1a.

This question uses a figure or table from the paper — you'll see it when you practise.

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Other parts of this question

  1. 1(a)(ii)Redraw the circuit so that it will work.[1 mark]
  2. 1(a)(iii)State which readings should be taken.[1 mark]
  3. 1(b)(i)a)Determine the e.m.f., E, of the battery using the graph in Figure 1b.[3 marks]
  4. 1(b)(i)b)Determine the internal resistance, r, of the battery using the graph in Figure 1b.[3 marks]
  5. 1(b)(ii)Explain how the result would have been affected if the resistance of the voltmeter were comparable to that of R.[1 mark]

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