Physics Unit21: Electromagnetic Induction & Faraday's Law (id: aa4b0d224)

本题目来源于试卷: Physics Unit21: Electromagnetic Induction & Faraday's Law，类别为 国际高中通用物理

[单选题]
In a transformer, if the secondary coil js fp+, wkbum+of:gix c 701+vcontains more l,fcb gwg:;gl p/c3 tv/oops than the primary coil then i/p ;,v/cfggt3wlbc g :t is a

A. step-up transformer.
B. step-down transformer.
C. either a step-up or a step-down transformer.
D. can not be determined.


参考答案:  A


本题详细解析: 暂无

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