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

46.08kJ

Step-by-step 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})*(\textrm{Wattage of each bulb})\textrm{ = }24*32W\textrm{ = }768W.`

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

`Power\textrm{ = }(Energy)/(time)`

`Energy\textrm{ = }Power* time \textrm{ = }768\textrm{ }W*1\textrm{ }min\textrm{ = }768\textrm{ }(J)/(sec)* 60\textrm{ }sec\textrm{ = }46,080J`

∴ Energy required =
`46,080J=46.08kJ`

Answer 2

Energy= 46.08KJ

Step-by-step explanation:

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

We know that Power =
`(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