Electromagnetic Induction and Alternating Current: Transformer — No-Load Loss MCQ

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Transformer — No-Load LossHardQuestion 20237

Question

Even at no load, a transformer draws some current from the supply. This no-load current mainly supplies:

A
Copper loss in windings
B
Core losses: hysteresis and eddy current losses
Correct
C
Current to the connected load
D
Power to the primary resistance only

Correct answer

Core losses: hysteresis and eddy current losses

Explanation

At no load, the primary still magnetises the core (hysteresis loss) and eddy currents flow in the core material (eddy current loss). These core losses are nearly constant regardless of load current and represent the transformer's idle energy consumption.

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