27) A 2 kW heater, a 400 W TV and three 150 w lamps are all switched on from 6 am to
p.m. What is the total cost at Rs. 8.50 per kWh ?
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Answer:
For heater,
Power = 2000 W
Time switched on = 12 hours
Units consumed = Power*Time/1000
= 2000*12/1000
= 24 kWh
For TV,
Power = 400 W
Time switched on = 12 hours
Units consumed = 400*12/1000
= 4.8 kWh
For Lamps,
Power = 150*3 = 450 W
Time consumed = 12 hours
Units consumed = 450*12/1000
= 5.4 kWh
Total consumed units in a day = ( 5.4+4.8+24 ) kWh
= 34.2 kWh
Cost for a day = (34.2*8.5)
= Rs. 290.7
Cost for a month = (290.7*30)
= Rs. 8721
I hope that helps.
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