An electric refrigerator rated 400W operates 8 hour/day. What is the cost of the energy to operate it for 30 days at Rs 3 per kWh?
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Hey mate...
Power of the electric refrigerator,
P=400W
=400/1000kW = 0.4 kW
Time for which the refrigerator was operated,
t=30×8h=240h
Energy consumed=P×t
=0.4kW×240h
=95kWh
cost of the energy used by the refrigerator=96×3
=₹288
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