n) An energy meter is designed to make 100 revolutions of the disc for one unit of
energy. Calculate the number of revolutions made by it , when connected to a load
carrying 40 A at 230V and 0.4 p.f. for 1 hour. If it actually makes 360 revolutions, find
the percentage error.
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1. A 240 volt, 5 ampere, single phase energy meter has a constant of 1200 revolutions per kilo watt hour (KWh). When tested by applying 240 volts, the meter took 99.8 seconds to complete 40 revolutions.
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