An electric refrigerator rated 400 W operates 8 hour/day. What isthe cost of the energy to operate it for 30 days at Rs 3.00 per kW h?
Last updated at Aug. 6, 2019 by Teachoo
Transcript
Example 12.13 An electric refrigerator rated 400 W operates 8 hour/day. What is the cost of the energy to operate it for 30 days at Rs 3.00 per kW h? Power of the fridge = P = 400 W Time taken to consume (per day) = t = 8 hours To find cost, we need to find energy consumed in 30 days We know that, Power = (πΈπππππ¦ ππππ π’πππ)/(ππππ π‘ππππ ) Energy consumed = Power Γ Time taken = P Γ t = 400 Γ 8 = 3200 Wh = 3200/1000 kWh = 3.2 kWh Finding energy consumed in 30 days Energy consumed in 1 day = 3.2 kWh Energy consumed in 30 day = 30 Γ 3.2 kWh = 30 Γ 32/10 = 3 Γ 32 = 96 kWh Finding cost Cost of 1 kWh = Rs 3 Cost of 92 kWh = 96 Γ 3 = Rs 288 Cost of energy consumption is Rs 288
Examples from NCERT Book
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