## 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?

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Last updated at Aug. 6, 2019 by Teachoo

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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

Class 10

Chapter 12 Class 10 - Electricity

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.