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2 marksElectrical Circuits

CAPE Physics Unit 2 · 2002 · Paper 2 · Question 1(a)

An experiment to determine the internal resistance r and e.m.f. E of a cell using an ammeter, voltmeter, and variable resistor.

Draw a circuit diagram showing how to connect the cell, ammeter, voltmeter, and variable resistor to measure the internal resistance and e.m.f. of the cell.

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Other parts of this question

  1. 1(b)(i)Draw the best straight line through the points plotted on Figure 1.[1 mark]
  2. 1(b)(ii)a)From the graph in Figure 1, deduce the value of the internal resistance of the cell.[2 marks]
  3. 1(b)(ii)b)From the graph in Figure 1, deduce the e.m.f. of the cell.[1 mark]
  4. 1(iii)Hence, calculate the current through the circuit and the potential difference across the terminals of the cell when connected to a 3 Ω resistor.[3 marks]
  5. 1(iv)State what instrument could be used instead of the voltmeter to obtain more accurate voltage readings.[1 mark]

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