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

An electric lamp consumes 2 kWh of electricity in 50 hrs. Its power is 40 W.
Given,
Energy consumed, E=2 units or
        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 x t

 where, P is the power, E is the energy and t is the time.
it can also be written as
$\Rightarrow \mathrm{P}=\mathrm{ }\frac{\mathrm{E}}{\mathrm{t}}$
on substituting the given values, we get the power as
$\Rightarrow \mathrm{P} =\mathrm{ }\frac{2000}{50}$ $\Rightarrow \mathrm{P} =\mathrm{ }40 \mathrm{W}$ So, the power is $\mathbf{40}\mathbf{ }\mathbf{W}$.