Q5. In a household, an electric bulb of 100 W is used for 10 hours and an electric heater of 1000 W for 2 hours daily. Calculate the cost of using the bulb and the heater for 30 days if the cost of one unit of electrical energy is ` 2.
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Answered by
0
Bulb Rating =60 W = .06 kW
Bulb illuminates for = 10hrs/day
Bulb consumes units( kWH)/day= .06×10= .6kWH/ day = .6 units/ day
In 30 days = .6×30 = 18units
1 unit cost = 2
18 units cost = 2×18=36
Therfere Rs.36/- has to be paid in a month
I hope it's useful
Bulb illuminates for = 10hrs/day
Bulb consumes units( kWH)/day= .06×10= .6kWH/ day = .6 units/ day
In 30 days = .6×30 = 18units
1 unit cost = 2
18 units cost = 2×18=36
Therfere Rs.36/- has to be paid in a month
I hope it's useful
Answered by
7
Energy used by heater =100wx(10hx30days) =30000wh =30unit
Energy used by bulbs =1000w(2h ×30days) =60kwh =60units
Total Energy = 60+30 =90Units
Cost =90×2 =180 rupees
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