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Science · 2023 · 5 marks
CBSE 2023 · Region 4 · Set 1 · Q36
(i)How is electric current related to the potential difference across the terminals of a conductor? Draw a labelled circuit diagram to verify this relationship.(ii)Why should an ammeter have low resistance?(iii)Two V-I graphs A and B for series and parallel combinations of two resistors are as shown. Giving reason state which graph shows(a)series, (b) parallel combination of the resistors.
(i)
How is electric current related to the potential difference across the terminals of a conductor? Draw a labelled circuit diagram to verify this relationship.
(ii)
Why should an ammeter have low resistance?
(iii)
Two V-I graphs A and B for series and parallel combinations of two resistors are as shown. Giving reason state which graph shows
(a)
series, (b) parallel combination of the resistors.
Marking-scheme solution
(i) Current flowing through a conductor is directly proportional to the potential difference. / V \(\displaystyle \alpha \mathrm{I} / \mathrm{I} \alpha \mathrm{V}\)
(ii) Since ammeter is connected in series, it should not increase the resistance of the circuit. / should allow maximum current to flow through the circuit.
(iii) • Series combination - Graph A Less slope and more resistance
Parallel combination - Graph B More slope and less resistance
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CBSE Class 10 Science past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.