{{tag>conversion power energy chapter1_1}}
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#@TaskTitle_HTML@##@Lvl_HTML@#~~#@ee1_taskctr#~~  Conversion: Vacuum Cleaner                  #@TaskText_HTML@#   

Your $18~{\rm V}$ vacuum cleaner is equipped with a $4.0~{\rm Ah}$ battery, it runs $15~{\rm minutes}$. \\
How much electrical power is consumed by the motor during this time on average?

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\begin{align*}
W &= 18~{\rm V} \cdot 4.0~{\rm Ah} = 72~{\rm Wh} \\ \\
t &= 15~{\rm min} = 0.25~{\rm h} \\ \\

P &= {{W         } \over {t          }} \\
  &= {{72~\rm Wh} \over {0.25~\rm h }} = 288~{\rm W}  
\end{align*}


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#@ResultBegin_HTML~1~@#
\begin{align*}
288~{\rm W}
\end{align*}
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