An electric heater draws a current of 10A from a 220V supply what is the cost of using the heater 5 hours per day for 30 days if the cost per 1kwh is Rs 5.20
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I=10A
V=220V
t=5*3600 sec
P=10*220=2200w
work done in one day = 3600*5*2200 J
=396*10^5 J
work done in 30days =1188*10^6J
work done in units= 1188*10^6/3.6*10^6
= 330 kwh
now,
rate=rs 5.20/1kwh
cost=330*5.20
=Rs 1716
hope it helps...
V=220V
t=5*3600 sec
P=10*220=2200w
work done in one day = 3600*5*2200 J
=396*10^5 J
work done in 30days =1188*10^6J
work done in units= 1188*10^6/3.6*10^6
= 330 kwh
now,
rate=rs 5.20/1kwh
cost=330*5.20
=Rs 1716
hope it helps...
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