ICSE Class 10 Physics 2013 Solved 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)\;=\;{\;\text " Total voltage diff. "\;( {\V})}/{\;\text " Total resistance "\;( {\R})}

0 ⋅ 5\;=\;{6}/{3+ {\R}}

{\R}+3\;=\;{60}/{5}

{\R}\;=12-3

{\R}\;=9 Ω

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