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Q.

[9]

1 kWh is equivalent to?


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a

3.6 × 106 J

b

 3.6 × 107

c

3.6 × 104 J

d

3.6 ×105 J 

answer is A.

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Detailed Solution

1 kWh is equivalent to 3.6 × 106 J.
We know that the SI unit of energy is joule and the commercial unit is kilowatt-hour.
                   1kWh = 1kW × 1h
                                   = 1000 W × 60 × 60 s
And 1 kW= 1000 W
1 = 60 × 60 second 
So,      1 kWh = 3600000 J
     1 kWh = 3.6 × 106 J
   
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