Physics Electromagnetic Induction PMDC 2021
PMDC Verified Question 58 of 69
In a step-up transformer, current across secondary is ____
A
More
B
Less
C
Equal
D
None
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Less
Concept:

A transformer adheres to the law of conservation of energy. For an ideal transformer, Input Power = Output Power.

Formula:

$$ V_p I_p = V_s I_s $$

Solution:

  • In a step-up transformer, the secondary voltage is greater than the primary voltage (\( V_s > V_p \)).


  • To keep the power constant, the secondary current must decrease proportionally. Thus, \( I_s < I_p \), meaning the current across the secondary is less.


Why other options are incorrect:

If current were more or equal while voltage increased, the transformer would generate energy out of nowhere, violating the law of conservation of energy.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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