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Science · 2025 · 2 marks
CBSE 2025 · Region 3 · Set 1 · Q26
An electric kettle is rated 230 V; 1000 W. Calculate the resistance of its heating element when in operation.
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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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.