Question

An electric bulb consumes 7.2kj of electrical energy in 2 min. what is the power of the electric bulb?

Answer 1

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Answer 2

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$\huge\sf{\underline{\underline\red{Solution-}}}$

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$\sf{\underline{\underline\green{Answer-}}}$

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• The power of the electric bulb is 60 watts.

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$\sf{\underline{\underline\red{Explanation-}}}$

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We know that:

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$\begin{gathered}:\implies\sf {Power= \frac{Energy\:Consumed}{Time\:Taken}} \end{gathered}$

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Here,

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$\begin{gathered}:\implies\sf \: Energy Consumed = 7.2kj \end{gathered}$

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$\begin{gathered}:\implies\sf \: Energy Consumed = 7.2 \times 1000j \end{gathered}$

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$\begin{gathered}:\implies\sf \: Energy Consumed = 7200j\end{gathered}$

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And:

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$\begin{gathered}:\implies\sf \: Time\:Taken= 2 \: min \end{gathered}$

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$\begin{gathered}:\implies\sf \: Time\:Taken= 2 \times 60 \: seconds\end{gathered}$

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$\begin{gathered}:\implies\sf \: Time\:Taken= 120s \: \end{gathered}$

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$\sf{\underline{\underline\green{Putting\:the\:Values-}}}$

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$\begin{gathered}:\implies\sf \:Power =\dfrac{7200J}{120 \: sec} \end{gathered}$

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$\begin{gathered}:\implies\sf Power= {\dfrac{\cancel{7200}J}{\cancel{120} \: sec}\:}\end{gathered}$

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$\begin{gathered}:\implies\sf \:Power=60J/s=60 \: Watts.\end{gathered}$

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• Thus, the power of the electric bulb is 60 Watts.

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