a household circuit, an electric bulb of 100 W is used for 10 hours and an electric heater of 1000 W for 2 hours everyday. Calculate the cost of using the bulb and the heater of 30 days if the cost of one unit of electrical energy is two rupees.
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Answered by
13
Energy used by the bulb = 100x10= 1000W=1KWh
Energy used by the heater=1000x2=2KWh
Total energy used in 1 day = 3 KWh
Energy used in 30 days = 30x3=90KWh
Cost of 1 KWh = RS.2
cost of 90KWh=2x90=Rs.180
Energy used by the heater=1000x2=2KWh
Total energy used in 1 day = 3 KWh
Energy used in 30 days = 30x3=90KWh
Cost of 1 KWh = RS.2
cost of 90KWh=2x90=Rs.180
Answered by
10
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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