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]
A power transmission line 50 km long has a total resistanz/ r 2tqri1 2fyl )0ahsqjq)5oce of .96vgmx ,zpiu0.60 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.,9ig xvz.mpu6 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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