Discussion
A transformer's load loss varies as
Answer: C
Correct answer: the square of the load current
Load loss is the copper loss, \( I^2R \), so it varies with the square of the current: a transformer at half load has a quarter of its full-load copper loss. The no-load or iron loss, by contrast, is essentially constant while the unit is energised, and the interaction of those two different laws is what produces the efficiency peak examined elsewhere in this topic.
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