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Physics Unit21: Electromagnetic Induction & Faraday's Law (id: baa8a6ecb)

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admin 发表于 2024-2-6 11:30:58 | 显示全部楼层 |阅读模式
本题目来源于试卷: Physics Unit21: Electromagnetic Induction & Faraday's Law,类别为 通用国际物理

[单选题]
A power transmission line 50 km long has a tjgzal m8 n,:l7 2szzh9otal resistance of 0.6005m b ytr0fv1dn9f0-sj +mlpj W. A generator produces 100 V at 70 A. In order to reduce et5jbpv n s+l1 j-df9f0r0y0mmnergy loss due to heating of the transmission line, the voltage is stepped up with a transformer with a turns ratio of 100:1. What percentage of the original energy would be lost if the transformer were not used?

A. 0.0042%
B. 0.042%
C. 4.2%
D. 42%


参考答案:  D


本题详细解析: 暂无

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