Question

Derive the relation between kilowatt hour and joule....

Answer 1

We know that kWh is a commercial unit
1kWh = 1kW * 1h
1000 W * 3600 seconds
1 watt * second = 1 joule
1kWh = 3600000 J

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Answer 2

Answer:

1kWh = 3.6 * 10^6 J

Explanation:

We know,

1 KW = 1000 W

1 hr = 60 * 60 seconds

Therefore,

1 kWh = 1000 Watt * ( 60 * 60 ) seconds

1 kWh = 10³ W *3600 s

1 kWh = 10³ W * ( 3.6* 10³ ) s

1kWh = ( 3.6* 10^6 ) Ws

1 Ws = 1 joule

Hence,

1kWh = 3.6 * 10^6 J