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

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Answer 1 · 2016-06-03T00:31:58

$7000J$

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,

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