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A $20 W$ bulb is used for $5 hours$ . The energy consumed is [[1]] $Wh$ .

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Detailed Solution

20 W

bulb is used for

5 hours

. The energy consumed is

100 Wh

.
Given,
Power of the bulb,

P = 20 W

Time for which the bulb is used,

t = 5 hours

Electric power is the quantity which determines the rate of change of energy which is delivered to a circuit. The SI unit of power is Watt. It is denoted by

P

.
We know that power,

P = \frac{E}{t}

Where, E is the energy consumed
So, energy consumed,

E = P \times t

⇨

E = 20 \times 5

⇨

E = 100 Wh

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