Question

An electric fan has a power output of 60 W. How much work is done if the fan operates for 120 s?

Answer 1

`7000J`

Explanation:

Recall the formula for power:

`color(blue)(|bar(ul(color(white)(a/a)P=W/(Deltat)color(white)(a/a)|)))`

`ul("where")`:
`P=`power
`W=`work
`Deltat=`change in time

To determine the work done, you need to rearrange the formula and solve for `W`.

Rearranging the formula,

`W=PDeltat`

Plug in the values.

`W=(60W)(120s)`

Solve.

`W=7200J`

Accounting for the appropriate number of significant digits,

`W~~color(green)(|bar(ul(color(white)(a/a)7000Jcolor(white)(a/a)|)))`