Question

A classroom has 24 fluorescent bulbs, each of which is 32 W. how much energy does it take to light the room for a minute?(unit=J)PLEASE HELP

Answer 1

Answer:

Energy= 46.08KJ

Explanation:

Given that the power needed to light each bulb is 32W

We know that Power = $\frac{energy}{time}$

The energy needed to light one bulb=$power*time$

Given time = 1minute = 60 seconds

Energy = $32W*60sec$=1920J

Therefore energy needed to light one bulb is 1920J

The energy needed to light 24 bulbs = $1920*24$ =46080J=46.08KJ

Answer 2

46.08kJ

Explanation:

        There are a total of 24 bulbs in the room, each of which has a rated wattage of 32 W.

        We need to light the room for a minute. Total power demanded by bulbs=$(\textrm{Number of bulbs})\times(\textrm{Wattage of each bulb})\textrm{ = }24\times32W\textrm{ = }768W.$

        We now know the demanded power. Power is energy required per unit time.

$Power\textrm{ = }\frac{Energy}{time}$

$Energy\textrm{ = }Power\times time \textrm{ = }768\textrm{ }W\times1\textrm{ }min\textrm{ = }768\textrm{ }\frac{J}{sec}\times 60\textrm{ }sec\textrm{ = }46,080J$

∴ Energy required = $46,080J=46.08kJ$