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Science · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 1 · Q34 (b)
An electric heater is rated 220 V; 11 A. Calculate the power consumed if the heater is operated at 200 V.
An electric heater is rated $\displaystyle 220$ V; $\displaystyle 11$ A. Calculate the power consumed if the heater is operated at $\displaystyle 200$ V.
Marking-scheme solution
Resistance of electric heater \(\displaystyle \mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}}\)
\[\mathrm{R}=\frac{220}{11}
\]
\[R=20 \Omega
\]
\[P=\frac{V^{2}}{R}
\]
\[\mathrm{P}=\frac{200 \times 200}{20}
\]
\[\text { P = 2000W/ } 2 \text { kW }
\]
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CBSE Class 10 Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.