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An electric lamp consumes $2 kWh$ of electricity in $50 hrs$ . Its power is

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100 W

25 W

40 W

20 W

answer is C.

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Detailed Solution

An electric lamp consumes

2 kWh

of electricity in

50 hrs

. Its power is

40 W

.
Given,
Energy consumed,

E = 2 units

E = 2000 Wh

Time,

t = 50 h

“Energy consumed is the product of power of the appliance and time taken by it.” So, the electrical energy is given by

E = P \times t

where,

P

is the power,

E

is the energy and

t

is the time.
it can also be written as

\Rightarrow P = \frac{E}{T}

on substituting the given values, we get the power as

\Rightarrow P = \frac{2000}{50}

\Rightarrow P = 40 W

So, the power is

40 W

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