Measurements are made of the current in a metal wire and the potential difference (p.d.) across it. Fig. 10.1 shows a graph of the current against the p.d. for the wire. [Figure 10.1]

1. (a)(i)State the relationship between the current and the p.d. for the metal wire.[1]
2. (a)(ii)State how the graph shows that the temperature of the wire does not change in the experiment.[1]
3. (a)(iii)1Another wire of the same material has the same length as the original wire but has only half the cross-sectional area. Compare the resistance of the new wire and the original wire.[1]
4. (a)(iii)2On Fig. 10.1, draw the graph for the new wire.[1]
5. (b)(i)1Three resistors are connected to a d.c. power supply, as shown in Fig. 10.2. The electromotive force (e.m.f.) of the power supply is 6.0 V. Calculate the total resistance of the circuit,[2]
6. (b)(i)2the current supplied by the power supply,[2]
7. (b)(i)3the p.d. across the 20Ω resistor.[2]
8. (b)(ii)1The d.c. power supply is a battery that contains a number of cells. Each cell has an electromotive force (e.m.f.) of 1.5V. State what is meant by the electromotive force (e.m.f.) of a cell.[1]
9. (b)(ii)2In the space below, draw a diagram to show how four of these cells are connected to make a battery of e.m.f. 6.0 V. Mark the positive terminal of the battery.[2]
10. (b)(ii)3In another arrangement to produce a battery of e.m.f. 6.0V, eight cells of e.m.f. 1.5V are connected. In this arrangement, some cells are connected in series and some in parallel. In the space below, draw a diagram to show how the eight cells are connected to make the battery.[1]
11. (c)State one advantage of using a battery made from cells in parallel rather than a single cell.[1]

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