Answer:
Energy= 46.08KJ
Explanation:
Given that the power needed to light each bulb is 32W
We know that Power = [tex]\frac{energy}{time}[/tex]
The energy needed to light one bulb=[tex]power*time[/tex]
Given time = 1minute = 60 seconds
Energy = [tex]32W*60sec[/tex]=1920J
Therefore energy needed to light one bulb is 1920J
The energy needed to light 24 bulbs = [tex]1920*24[/tex] =46080J=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=[tex](\textrm{Number of bulbs})\times(\textrm{Wattage of each bulb})\textrm{ = }24\times32W\textrm{ = }768W.[/tex]
We now know the demanded power. Power is energy required per unit time.
[tex]Power\textrm{ = }\frac{Energy}{time}[/tex]
[tex]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[/tex]
∴ Energy required = [tex]46,080J=46.08kJ[/tex]
