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Science · 2025 · 3 marks
CBSE 2025 · Region 4 · Set 3 · Q32
Define the term "potential difference" between two points in an electric circuit carrying current. Name and define its S.I. unit. Also express it in…
Define the term "potential difference" between two points in an electric circuit carrying current. Name and define its S.I. unit. Also express it in terms of S.I. unit of work and charge.
Marking-scheme solution
The work done to move a unit charge from one point to other in a conductor. / (V=W/Q)
volt (V)
In a current carrying conductor, when one joule of work is done to move a charge of $\displaystyle 1$ coulomb from one point to another.
$\displaystyle 1$ volt = $\displaystyle 1$ joule/$\displaystyle 1$ coulomb or \(\displaystyle 1 \mathrm{~V}=1 \mathrm{~J} \mathrm{C}^{-1}\)
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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.