Question:
Consider four circuits shown in the figure below. In which circuit power dissipated is greatest? (Neglect the internal resistance of the power supply).
Consider four circuits shown in the figure below. In which circuit power dissipated is greatest? (Neglect the internal resistance of the power supply).
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Maximum power when equivalent resistance is minimum.
Updated On: Apr 7, 2026
- Circuit A
- Circuit B
- Circuit C
- Circuit D
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Power \(P = E^2/R_{eq}\), minimum R gives max power.
Step 2: Detailed Explanation:
Let each \(R = 1\ \Omega\)
A: \(R_{eq} = 0.5\ \Omega\), \(P = 2E^2\)
B: \(R_{eq} = 2\ \Omega\), \(P = 0.5E^2\)
C: \(R_{eq} = 1.5\ \Omega\), \(P = 0.67E^2\)
D: \(R_{eq} = 0.67\ \Omega\), \(P = 1.5E^2\)
A gives highest power.
Step 3: Final Answer:
Circuit A dissipates greatest power.
Power \(P = E^2/R_{eq}\), minimum R gives max power.
Step 2: Detailed Explanation:
Let each \(R = 1\ \Omega\)
A: \(R_{eq} = 0.5\ \Omega\), \(P = 2E^2\)
B: \(R_{eq} = 2\ \Omega\), \(P = 0.5E^2\)
C: \(R_{eq} = 1.5\ \Omega\), \(P = 0.67E^2\)
D: \(R_{eq} = 0.67\ \Omega\), \(P = 1.5E^2\)
A gives highest power.
Step 3: Final Answer:
Circuit A dissipates greatest power.
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