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An energy meter makes 100 revolutions of its disc per unit of energy. The number of revolutions made by the disc during one-hour when connected across 210 V source and drawing a current of 20 A at 0.8 pf leading is

An energy meter makes 100 revolutions of its disc per unit of energy. The number of revolutions made by the disc during one-hour when connected across 210 V source and drawing a current of 20 A at 0.8 pf leading is Correct Answer 336

Voltage (V) = 210 V

Current (I) = 20 A

Power factor (cos ϕ) = 0.8

Number of revolutions per hour = 100

E = VI cos ϕ t × 10-3 kWh

= 210 × 20 × 0.8 × 1 × 10-3

= 3.36 kWh

Total number of revolutions = 3.36 × 100 = 336

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