CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 27

Electricity 2 marks Medium

The current flowing through a resistor connected in a circuit and the potential difference developed across its ends are as shown in the diagram by milliammeter and voltmeter readings respectively :

(a)What are the least counts of these meters ?
(b)What is the resistance of the resistor ?

Answer

Least counts are 10 mA (milliammeter) and 0.1 V (voltmeter); the resistance is $9.6 Ω$ .

(a) Milliammeter:

10

divisions between

100

mA and

200

mA, so least count

= \frac{100 mA}{10} = 10

mA. Voltmeter:

10

divisions between

1

V and

2

V, so least count

= \frac{1 V}{10} = 0.1

V. (b) Current

I = 250

= 0.25

A; potential difference

V = 2.4

V. Resistance

R = \frac{V}{I} = \frac{2.4 V}{0.25 A} = 9.6 Ω

🔒 Step-by-step solution

CBSE Class 10 Science 2019 · Paper 31/2/1 · Question 27

Answer

From the board papers

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