The efficiency of a transformer, under heavy loads, is comparatively low because
A)copper loss becomes high in proportion to the output
B)iron loss is increased considerably
C)voltage drop both in primary and secondary becomes large
D)secondary output is much less as compared to primary input

Question

Quizplus · Accepted Answer

Copper loss (I^2R loss) in a transformer increases with the load because it is dependent on the square of the current. Under heavy loads, the current increases, leading to higher copper losses, which in turn reduces the efficiency of the transformer.

The Efficiency of a Transformer, Under Heavy Loads, Is Comparatively