An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What

Question

An electric bulb consumes 7.2 kJ of electrical energy in 2 minutes. What is the power of the electric bulb?

Options:

A .

40 W

B .

60 W

C .

50 W

D .

70 W

Answer: Option B
:
B
Given, energy E

= 7.2 k J = 7.2 \times 10^{3} J

and time t

= 2 m i n u t e s = 2 \times 60 = 120 s

.
We know, power,

P = \frac{E n e r g y o r W o r k}{t} = \frac{7.2 \times 10^{3}}{120} = 60 W

∴

The power of electric bulb is

60 W

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