{{tag>conversions energy consumption chapter1_1}}
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<WRAP mexle-task-title>
~~#@ee1_taskctr~~  Conversion: Energy Consumption                   
</WRAP>

   

Convert the following values step by step:

How much energy does an average household consume per day when consuming an average power of $ 500~{\rm W} $? \\
How many chocolate bars ($2'000~{\rm kJ}$ each) does this correspond to?


<button size="xs" type="link" collapse="mexle-aef8c2a62e42-1">Solution steps</button>
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\begin{align*}
W &= 500~{\rm W} \cdot 24~{\rm h} = 12000~{\rm Wh}= 43'200'000~{\rm Ws} = 43'200~{\rm kWs} &&= 43'200~{\rm kJ} \\
\text{Or:  } 
W &= 0.5~{\rm kW} \cdot 24~{\rm h} = 12~{\rm kWh} = 43'200~{\rm kWs}                       &&= 43'200~{\rm kJ} \\ \\

n_{\rm bars} &={{43'200~{\rm kJ}}\over{2'000~{\rm kJ}}} = 21.6~{\rm chocolate~bars} \\
\end{align*}

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<button size="xs" type="link" collapse="mexle-aef8c2a62e42-2">Result</button>
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\begin{align*}
22~{\rm chocolate~bars}
\end{align*}

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