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Question

# An electric heater of resistance 8 Ω draws a current of 15 A from the service mains operated for 2 h. What is the cost of the energy to operate it for 30 days at Rs 3.00 per kWh?

A
Rs. 108
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B
Rs. 324
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C
Rs. 360
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D
Rs. 420
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Solution

## The correct option is B Rs. 324Given: Resistance, R=8 Ω Current drawn, i=15 A Time duration, =2 h per day. Cost of operating, Rs. 3 per kWh The energy E consumed by the heater in 1 day would be: E=i2Rt=152×8×2 or E=3600 Wh=3.6 kWh The total energy H consumed by the heater in 30 days would be: H=3.6×30 kWh=108 kWh Cost of operating at the rate of Rs. 3/kWh=3×108 ⟹ Rs. 324/−

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