Question:
An electric heater rated 1500 W operates for 8 hour/day.What is the cost of energy to operate it for 30 days at Rs 4.00 per kWh?
Answer:
Power (P) = 1500 W = 1500/1000 = 1.5 kW
Time (t) = 8 x 30 = 240 hours
Now electrical energy (E) = P x t = 1.5 x 240 = 360 kWh
If , energy cost is 4 Rs = 1 kWh
Then, 360 kWh will cost = 360 x 4 = 1440 Rs
Thus, electric energy consumed by the refrigerator in a month will cost about 1440 Rs
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