Define Kilowatt hour. How many joules are there in one Kilowatt-hour?Calculate the cost of operating a heater of 500 watt for 20 hours at the rate of 3.90 per unit.
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Explanation:
One kilowatt hour is the amount of electrical energy consumed when an electrical appliance having a power rating of 1 kilowatt is used for 1 hour.
1 kWh=3.6×10^ 6 J
Given P=500W=0.5kW,t=20hr
We know that
Energy consumed =P×t=0.5×20
=10kWh
Total cost =10× cost per unit
Therefore, total cost =10×3.9=Rs.39
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