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CBSE Class 9 Answered

Home electricity bills come in units called Kilowatt-hour. How many joules is equal to 1 kilowatt hour. Why kilowatt hours are used instead of joules in the bill?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer
1 Kilowatt hour = 36, 00,000 joules = 3.6 x 106 J

One kilowatt hour is the amount of electrical energy consumed when an electrical appliance having a power rating of 1 kilowatt is used for 1 hour. Kilowatt hour is used for measuring electricity consumed, as joule represents a very small quantity of energy and therefore it is inconvenient to use joules where large quantities of energy is involved.
Answered by | 04 Jun, 2014, 03:23: PM

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