A filament lamp connected to a 12V power supply transfers 24W of power.

1. (a)Calculate:
2. (a)(i)the current in the lamp current = ................................................................. A [2][2]
3. (a)(ii)the resistance of the lamp in this circuit. resistance = ................................................................. Ω [2][2]
4. (b)A student has a battery of electromotive force (e.m.f.) 12V. The student uses the battery in a circuit with the 12V filament lamp to obtain a range of suitable readings and plots the current-voltage graph for the lamp.
5. (b)(i)Fig. 7.1 shows the battery and the filament lamp. [Figure 7.1] On Fig. 7.1, complete the circuit diagram of a suitable circuit. You will need to add additional components.[2]
6. (b)(ii)On Fig. 7.2, draw the shape of the current-voltage graph for the filament lamp. [Figure 7.2][2]
7. (b)(iii)State what happens to the resistance of a filament lamp as the applied voltage increases and explain one reason for this happening.[2]

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