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Science · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 1 · Q33
(a)State Ohm's law. Write formula for the equivalent resistance $\displaystyle \mathrm{R}_{\mathrm{p}}$ of the parallel combination of three resistors of values $\displaystyle \mathrm{R}_{1}, \mathrm{R}_{2}$ and $\displaystyle \mathrm{R}_{3}$.(b)Find the resistance of the following network of resistors :
(a)
State Ohm's law. Write formula for the equivalent resistance $\displaystyle \mathrm{R}_{\mathrm{p}}$ of the parallel combination of three resistors of values $\displaystyle \mathrm{R}_{1}, \mathrm{R}_{2}$ and $\displaystyle \mathrm{R}_{3}$.
(b)
Find the resistance of the following network of resistors :
Marking-scheme solution
(a)
Ohm's Law - The potential difference, \(\displaystyle V\), across the ends of a given metallic wire in an electric circuit is directly proportional to the current flowing through it, provided its temperature remains the same.
Formula :- \(\displaystyle \frac{1}{\mathrm{R}_{\mathrm{p}}}=\frac{1}{\mathrm{R}_{1}}+\frac{1}{\mathrm{R}_{2}}+\frac{1}{\mathrm{R}_{3}}\)
(b)
\(\displaystyle \mathrm{R}+\frac{R}{2}=\frac{3 R}{2}\)
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CBSE Class 10 Science past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.