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an electric fan of power 100w is allowed to run 10 hrs/ day. what is the cost of energy to operate it for 30 days at Rs. 4 per kwh? |
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Answer» Answer: Five bulbs consume the power of 100 W each.
The TOTAL power consumed by 5 bulbs = 5 x 100 = 500 W = 0.5 kilowatt
Electrical energy consumed daily is, E = P x t = 0.5 kW x 10 hours = 5 kWh.
THUS, total electrical energy consumed for 30 days = 5 kWh x 30 days = 150 kWh or 150 units.
The cost of 1 unit of ELECTRICITY = Rs. 4 Thus, the total cost of electricity = Rs. 4 x 150 = Rs. 600 |
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