1. The reading ‘100’ of a 120

1. The reading ‘100’ of a 120 V electrostatic voltmeter is to represent 10,000 V when its range is extended by the use of a capacitor in series. If the capacitance of the voltmeter at the above reading is 70 pF, find the capacitance of the capacitor multiplier required.

2. An electrodynamics wattmeter has a voltage circuit of resistance of 8 kΩ and inductance of 63.6 mH which is connected directly across a load carrying 8 A at a 50 Hz voltage of 240 V and p.f. of 0.1 lagging. Estimate the percentage error in the wattmeter reading caused by the loading and inductance of the voltage circuit.

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