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Solved 2022 Semester 2 Question Paper ICSE Class 10 Physics — Question 3

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Question

Question 2(iii)

In the below circuit diagram, calculate:

(a) the external resistance of the circuit.

(b) the current I2.

(c) the current I.

In the circuit diagram, calculate the external resistance of the circuit. ICSE 2022 Physics Solved Question Paper.
Answer

(a) 12Ω and 8Ω are in parallel.

1R\dfrac{1}{\text{R}} = 112\dfrac{1}{12} + 18\dfrac{1}{8} = 2+324\dfrac{2+3}{24} = 524\dfrac{5}{24}

So the equivalent resistance = 245\dfrac{24}{5} = 4.8Ω

2Ω is in series with this combination.

Hence the total resistance = 2 + 4.8 = 6.8Ω

(b) Potential difference across the 12Ω resistor = potential difference across 8Ω resistor

Or, 12 × 0.4 = 8 × I2

∴ I2 = 12×0.48\dfrac{12 × 0.4 }{8} = = 0.6 A

(c) Current I = I1 + I2 = 0.4 + 0.6 = 1 A