The total power dissipated in the 8 Ω resistor in the circuit shown is 2 W. The power dissipated in a 3 Ω resistance is: [Diagram: Image]
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Question

The total power dissipated in the 8 Ω resistor in the circuit shown is 2 W. The power dissipated in a 3 Ω resistance is: [Diagram: Image]

G1 Physics · Accepted Answer

Step 1: Use the current split from 1 Ω and 3 Ω resistors in series (upper path) and 8 Ω lower path. Step 2: If P₈ = 2 W, the branch voltage is V = √(PR)=√16 = 4 V. Step 3: Upper branch current I = 4/(1+3) = 1 A. Step 4: Power in 3 Ω should be 3 W, corresponding to option B.