Physics Electromagnetic Induction UHS 2024
PMDC Verified Question 12 of 69
In an ideal transformer:
A
Power input is equal to power output
B
Power input is less than half of the power output
C
Power input is greater than power output
D
Power input is more than half of the power output
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Power input is equal to power output
Concept:

An "ideal" electrical device is a theoretical model that assumes 100% efficiency, meaning no energy is lost to heat, sound, or magnetic leakage.

Formula:

$$ P_{\text{in}} = P_{\text{out}} $$

Solution:

  • Since energy cannot be created or destroyed, an ideal transformer perfectly transfers all the electrical energy from the primary coil to the secondary coil.


  • Therefore, the Power input is exactly equal to the power output (\( V_p I_p = V_s I_s \)).


Why other options are incorrect:

Power output can never exceed power input (violates conservation of energy). If power input were greater than output, the transformer would not be "ideal" because it implies energy is being lost as heat.

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