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1 markElectrical Circuits

CAPE Physics Unit 2 · 2002 · Paper 2 · Question 1(b)(i)

Data collected relating terminal potential difference V and current I according to V = E - Ir is plotted on Figure 1.

Draw the best straight line through the points plotted on Figure 1.

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Other parts of this question

  1. 1(a)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.[2 marks]
  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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