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G5C05:Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?

G5C05G5C

Why is the primary winding wire of a voltage step-up transformer usually a larger size than that of the secondary winding?

Direct answer summary (2023-2027 NCVEC pool)

The official correct answer for G5C05 is To accommodate the higher current of the primary.

The reason is to accommodate the higher current of the primary. Connect the cause in the question to this direct result instead of memorizing the answer letter.

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