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Q23
(CISF/2020)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
An electric refrigerator rated 400 W operates 10 hours/day. What is the cost of the energy to operate it for 30 days at ₹ 3.00 per kWh ?
Result
Your answer:
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Correct:
A
Explanation
To calculate the total cost, we first determine the total energy consumed in kilowatt-hours (kWh):
- Power of the refrigerator: 400 W = 400/1000 kW = 0.4 kW.
- Total operating time: 10 hours/day × 30 days = 300 hours.
- Total energy consumed: Energy = Power × Time = 0.4 kW × 300 hours = 120 kWh.
Now, we calculate the cost based on the given rate:
- Cost: Total Energy × Rate per kWh = 120 kWh × ₹ 3.00/kWh = ₹ 360.
Thus, the cost of the energy to operate the refrigerator for 30 days is ₹ 360.
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