9.1 A simplified diagram of an electric generator is shown below. When the coil is rotated with a constant speed, an emf is induced in the coil.
9.1.1 Is this an AC generator or a DC generator?      (1)
9.1.2 Briefly explain how an emf is generated in the coil when the coil is rotated by referring to the
principle of electromagnetic induction. (2)
9.1.3 Draw a sketch graph of the output voltage versus time for this generator. Show ONE complete cycle. (2)
9.2 A 200 Ω resistor is connected to a DC voltage supply, as shown in diagram A. The energy dissipated in
the resistor in 10 s is 500 J.Â
The same resistor is now connected to an AC source (diagram B) and 500 J of energy is also dissipated in the resistor in 10 s.
9.2.1 Â Define the term rms voltage of an AC source. Â Â Â (2)
9.2.2 Â Calculate the maximum (peak) voltage of the AC source. Â (5)
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