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Question 1(a) Sketch a graph of emf induced in an inductive coil against rate of change of current. What is the significance of the gradient?

(b) Explain why it is difficult to measure the rate of change of current?

(c) How do graphs of emf against time and current against time make it possible to measure self-inductance?
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Question 2
(a) Current and voltage provided by an AC generator are sometimes negative and sometimes positive. Explain why for an AC generator connected to a resistor, power can never be negative?

(b) Explain using sketch graphs, why the frequency of variation of power in an AC generator is twice as that of the current and voltage.

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Question 3What determines the gradient of a graph of inductive reactance against frequency?

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Question 4How does doubling the frequency affect the reactance of (a) an inductor (b) a capacitor?

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Question 5If the peak value of a sin wave is 1000 volts, what is the effective value?

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Question 6Show that reactance is measured in ohms for both inductors and capacitors.
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Question 7Describe the principle of ECG.

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