1.

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?​

Answer»

Answer:

EXPLANATION:

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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