CBSE Class 10 Science 2018 · Paper 31/1/C · Question 27

Electricity 2 marks Easy

You have following material : An ammeter (0-1A), a voltmeter (0-3V), a resistor of

20 Ω

, a key, a rheostat, a battery of 3 V and seven connecting wires. Using this material draw a labelled circuit diagram to study the dependence of potential difference (

V

) across a resistor on the current (

I

) passing through it.

Answer

Battery, key, ammeter, resistor and rheostat are in series; the voltmeter is connected in parallel across the resistor.

The labelled circuit diagram is the figure at step 3: (i) The battery (3 V), the key K, the ammeter A (0–1 A), the resistor R (

20 Ω

) and the rheostat Rh are connected in series in one loop. (ii) The voltmeter V (0–3 V) is connected in parallel across the resistor R. (iii) The + terminals of the ammeter and the voltmeter are joined towards the + terminal of the battery. (iv) The seven wires: battery to key, key to ammeter, ammeter to R, R to rheostat, rheostat to battery, and two from the ends of R to the voltmeter. The rheostat is moved to change the current

I

, and

V

across R is noted for each value of

I

🔒 Step-by-step solution

CBSE Class 10 Science 2018 · Paper 31/1/C · Question 27

Answer

From the board papers

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