Quelpr
1 markElectrical Circuits

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

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

From the graph in Figure 1, deduce the e.m.f. of the cell.

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

The mark scheme is shown once you've answered.

Practise this question

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)(i)Draw the best straight line through the points plotted on Figure 1.[1 mark]
  3. 1(b)(ii)a)From the graph in Figure 1, deduce the value of the internal resistance of the cell.[2 marks]
  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]

More practice: the rest of this paper · more Electrical Circuits questions · all CAPE Physics Unit 2 past papers