ICSE Class 10 Physics 2013 Solved Paper

The figure shows a circuit

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

Question : 61

Total: 70

Calculate the value of the unknown resistor R.

Solution:

Let
Electric current (I)‌=‌

‌ Total voltage diff. ‌(V)

‌ Total resistance ‌(R)

0⋅5‌=‌

3+R

R+3‌=‌

R‌=12−3
R‌=9Ω

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