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Science · 2025 · 3 marks
CBSE 2025 · Region 1 · Set 3 · Q27
(a) Define one volt potential difference between two points in an electric field. (b) Draw a schematic diagram of an electric circuit of a cell of 1…
(a)
Define one volt potential difference between two points in an electric field.
(b)
Draw a schematic diagram of an electric circuit of a cell of $\displaystyle 1 \cdot 5 \mathrm{~V}$, $\displaystyle 5 \Omega$ and $\displaystyle 10 \Omega$ resistor and a plug key, all connected in series. Calculate the current drawn from the cell when the key is closed.
Marking-scheme solution
(a)
It is the amount of work done to bring one coulomb charge from one point to another in the field is $\displaystyle 1$ joule. \(\displaystyle / \mathrm{lV}=\frac{1 J}{1 C}\)
(b)
\[\begin{gathered}
\text { Current }=\frac{\text { Potential difference }}{\text { Resistance }}=\frac{1.5 \mathrm{~V}}{(\mathbf{5} \boldsymbol{\Omega}+\mathbf{1 0} \boldsymbol{\Omega})} \\
=\frac{1.5 \mathrm{~V}}{15 \Omega}=0.1 \mathrm{~A}
\end{gathered}
\]
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