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1 某變壓器無載時,一、二次側電壓比V1:V2 = 25:1,滿載時V1:V2 = 27:1,則電壓調整率為
A 10%
B 12%
C 17%
D 8%

設外加電壓V1為定值

無載時V2 =V1/25

滿載時V2 =V1/27

VR% =(V1/25-V1/27) / (V1/27)

分子分母同乘 (25×27)

(27V1-25V1) / (25V1)=2/25 = 8%