✓ Board-verified
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…
(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
More from Electricity
- (i) Consider the following electric circuit: Calculate the values of the following: (I) Total resistance of the circuit. (II) The total electric…2026
- A 2000 W heater has a resistance of about 25 Ω, whereas a 100 W bulb has a resistance of 500 Ω. When 220 V is applied on these, then which of the two…2024
- Show how you would connect three resistors each of resistance 6 Ω, so that the combination has a resistance of 9 Ω. Also justify your answer. OR In…2024
- In domestic electric circuits the wiring with 15 A current rating is for the electric devices which have2023
- Assertion: Electrons move from lower potential to higher potential in a conductor. Reason (R): A dry cell maintains electric potential difference…2024
- (i) State whether the currents and potential difference in all the bulbs will be same or different when in a circuit three bulbs of: same wattage are…2024
- Consider two lamps A and B of rating 50 W; 220 V and 25 W; 220 V respectively. Find the ratio of the resistances of the two lamps (i.e. R_A: R_B ).…2025
- Study the given electric circuit in which 2 A electric current is flowing between points X and Y. (i) Using the battery, key, voltmeter and ammeter…2026
CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.