Physics Current Electricity KU 2024
PMDC Verified Question 11 of 112
The maximum power transfer theorem states that maximum power is delivered to the load when ____.
A
The load resistance is half of the source resistance
B
The load resistance is zero
C
The load resistance is double the source resistance
D
The load resistance is equal to the source resistance
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: The load resistance is equal to the source resistance
Concept:

Optimization of electrical circuits specifically to get the highest wattage from a limiting source.

Solution:

  • According to the mathematically proven Maximum Power Transfer Theorem, power is maximized exclusively when the external circuit's total resistance (load) perfectly mirrors the internal resistance of the supplying battery or generator.


  • Therefore, the load resistance is equal to the source resistance.


Why other options are incorrect:

  • Opt A, B, C: Any value higher or lower than exact equality decreases the total fraction of \( P = \frac{E^2 R}{(R+r)^2} \).

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