Physics Unit21: Electromagnetic Induction & Faraday's Law (id: 1ba71fb68)

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 21bvfltt jhcd7 :f ,3ithe primar2svig*,zr s3mgnxm73 y coil contains more loops than the secondary coil then iz72nm3rvm*sgsi, 3 gxt 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:  B


本题详细解析: 暂无

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