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變壓器輸入電動勢輸出電動勢關係 E1/E2=N1/N2 由於理想變壓器線圈電阻可忽略所以線上圈電阻上的電壓降可以忽略 所以有U1/U2=N1/N2 U1U2就是代表電動勢减去線圈電阻的分壓比如在次線圈上就代表用電器的電壓
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