Question

A light bulb operating at 120 volts draws a current of 0.50 ampere for 240
seconds. The power rating of the light bulb is
W.

Answer 1

The power rating of the light bulb is 60 W

Explanation:

The power rating formula is given by,

P= I²×R

Rewrite the formula as

V=I×R

R=I/V

R= 120/0.50

R=240

P=I²×R

P=0.50²×240

P=60 W

The power rating of the light bulb is 60 W