CBSE 2025 · Region 3 · Set 1 · Q26 · 2 marks
An electric kettle is rated $\displaystyle 230$ V; $\displaystyle 1000$ W. Calculate the resistance of its heating element when in operation.
Marking-scheme solution
\[\begin{aligned}
& \mathrm{P}=1000 \mathrm{~W}, \mathrm{~V}=230 \mathrm{~V} ; \text { Formula }=P=\frac{V^{2}}{R} \\
& \mathrm{R}=\frac{\mathrm{V}^{2}}{\mathrm{P}} \\
& \quad=\frac{(230)^{2}}{1000} \\
& \quad=52.9 \Omega
\end{aligned}
\]
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