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Question
Calculate the total resistance of the circuit and find the total current in the circuit.
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Solution
R3 and R4 are in series, hence the equivalent resistance of those two = R5 = R3 + R4 = 10 ohms
R5 and R2 are in parallel, Let R6 be the equivalent resistance for them. Hence R6 = (R5 × R2)/(R5 + R2) = 100/20 = 5 ohms
Now R1 and R6 are in series and hence the final equivalent resistance of the entire circuit is R = R1 + R6 = 12 ohms
By Ohm's Law we know that V = IR, hence I = V/R.
Hence the current in the circuit is 24/12 A = 2A
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