Question

e. An electric lamp consumes 2 units of electricity in 50 hours. Its power is
1. 100 watt il. 25W iii. 40W iv. 20W
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Answer 1

Answer:e. An electric lamp consumes 2 units of electricity in 50 hours. Its power is

1. 100 watt il. 25W iii. 40W iv. 20W

Explanation:

Answer 2

(c)The power of the lamp is 40 W.

Explanation:

Given electric energy consumed, E= 2 units = 2 kWh (Kilowatt-hour)

time, t = 50 h

The electric energy consumed is equal to power multiply by time.

$E = P\times t$

Here, P is the power.

Substitute given values, we get

$2\times1000Wh=P\times50h$

$P=\frac{2000Wh}{50h}$

P = 40 W.

Thus, the power of the lamp is 40 W.

#Learn More: Energy power relation.

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