Correct Answer - Option 3 : 30 unit
CONCEPT:
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Electric power: The rate of work done by the electric current is called electric power.
Electric energy (E) = electric power (P) × time (t)
1 unit of energy = 1 kilowatt hour = 1 KWh
CALCULATION:
Given that:
power (P) = 1000 watt
time = 30 days
1 hr per day working
So total time = t = 30 × 1 hr = 30 hr
Energy (E) = P × t = 1000 × 30 = 30000 watt hour = 30 kilowatt hour = 30 unit.