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Q.

When a power of 1 kW is used for one hour, the electrical energy consumed is 1 kWh. The amount of energy used in joule is__


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a

3 ×106 J

b

2.6 ×106  J

c

3.6 ×106  J

d

1.6 ×106  J  

answer is C.

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Detailed Solution

 When a power of 1 kW is used for one hour, the electrical energy consumed is 1 kWh. The amount of energy used in joule is 3.6 ×106  J.
It is given that; a power of 1 kW is used for one hour
Then 1 kWh =1 kW ×1 h 
⇒ 1 kWh=1000 w ×60 ×60 s
⇒  1 kWh =3.6 ×106 Ws 
That is 3.6 ×106 J
 
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When a power of 1 kW is used for one hour, the electrical energy consumed is 1 kWh. The amount of energy used in joule is__