Calculate the value of the unknown resistor ...

ICSE Class 10 Physics 2013 Paper

The figure shows a circuit

When the circuit is switched on, the ammeter reads $0.5 A$ .

Question : 61 of 70

Marks: +1, -0

Calculate the value of the unknown resistor

R

Solution:

Let

Electric current

(I)=\frac{ \text{ Total voltage diff. } (V) }{ \text{ Total resistance } (R) }

0 \cdot 5 = \frac{6}{3 + R}

R + 3 = \frac{60}{5}

R = 12 - 3

R = 9 \Omega

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