A 2 kw heater, a 200 watt TV and three 100 watt lamps are all switched on from 6 p.m. to 9 p.m. What is the total cost of energy consumed at Rs. 7.30 per kWh ?
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We know that,
Total energy conserved, E=p×t
=[2+0.2+3×0.1]×4hr
=2.5×4Rwh
=10Rwh
Rs5.50=10×5.50=Rs55
We get, Rs55.
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