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Q.

A 100W bulb operates for 5 hours. Which one of the following is the electric energy consumed by it?


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a

1 kWh

b

0.5 kWh

c

1.5 kWh

d

none of these 

answer is B.

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Detailed Solution

The energy consumed by a bulb of power 100W in five hours is given by 0.5 kWh.
We know that energies are measured in the units of Joules. Electrical energy is calculated in kilowatt-hour. So, we need to first convert the power of the electric bulb to kilowatts, and then multiply it by the time to obtain the electrical energy consumed by this bulb.
Here, the power of the bulb is 100W.
1001000 = 0.1 kW
To calculate the energy consumed by this bulb in the given time
It is known that,
1 kWh = 3.6 MJ
Since, consumed electrical energy = power × time,
E=0.1 kW×5
⇒E=0.5 kWh
 
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