Physics
In the below circuit diagram, calculate:
(a) the external resistance of the circuit.
(b) the current I2.
(c) the current I.
Current Electricity
ICSE 2022
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Answer
(a) 12Ω and 8Ω are in parallel.
= + = =
So the equivalent resistance = = 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 = = = 0.6 A
(c) Current I = I1 + I2 = 0.4 + 0.6 = 1 A
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