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 501fk0x5ea 5-4 wvmb eu6ze iwp8 km long hasy e r.y+sdepa fg5po1hty qw:u:7*+2e a total resistance of 0.60 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 wy:qgrep72 +o +: ya fuw1p*seydeht 5.ith a transformer with a turns ratio of 100:1. What percentage of the original energy 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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