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(a) Derive the relation between commerci...

(a) Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).
(b) A certain household consumes 650 units of electricity in a month. How much is this electricity in joules ?

Text Solution

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Relation between kWh and Joules:
1 kWh = 1 kW `xx` 1 h = 1000 W`xx` 1 h
= 1000 (J/s) `xx` 3600 s
= 3600000 J =`3.6 xx 10^6` kWh = 1 kW `xx` 1 h
= 1000 W`xx`1h
= 1000 (J/s) `xx` 3600 s
= 3600000 J = `3.6 xx 10^6` J
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