An alternating current (a.c.) generator is used in a remote location to supply electricity.

1. (a)(i)State the name of the components labelled P and Q on Fig. 7.1. P ................................................................................................................................ Q ................................................................................................................................[1]
2. (a)(ii)When the generator is producing an electrical output, P is stationary and Q is rotating. Explain the purpose of P and Q.[2]
3. (b)(i)Write a letter X on the trace shown in Fig. 7.2 to indicate one point when the coil is vertical.[1]
4. (b)(ii)Using Fig. 7.2, determine the maximum value of the e.m.f. produced by the generator. maximum e.m.f. = ........................................................................ V[2]
5. (b)(iii)Using Fig. 7.2, determine, in milliseconds, the time it takes for one revolution of the coil. time for one revolution of the coil = .............................................................. ms[1]
6. (b)(iv)Determine the frequency of the output of the generator. frequency = ........................................................................ Hz[2]

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