某变压器一次绕组120匝,二次绕组240匝,由此可知,当输出电压要求为380V时,输人电压约为( )。A. 380V B. 190VC. 720V...

作者: rantiku 人气: - 评论: 0
问题 某变压器一次绕组120匝,二次绕组240匝,由此可知,当输出电压要求为380V时,输人电压约为( )。 A. 380V B. 190V C. 720V D. 220V
选项
答案 B
解析 变压器带载时,电压比等于一、二次绕组的匝数比,根据得,120/240 X 380V = 190V。

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