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 total resistance o57j esk 6 /1m )xlw1dd(gedcjhf 0.60-+bfhn.4layjdzpq 4 *nl k/o: W. A generator produces 100 V at 70 A. In order to reduce energy 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 ene 4llf+:k hdob4jnn/ ap*z-.qyrgy is lost when the transformer is used?
A. 0.0042%
B. 0.042%
C. 4.2%
D. 42%
参考答案: A
本题详细解析:
暂无
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