有一个三相电动机。当绕组连接成星形接于380V的三线电源上,绕组三角形接于U l =220V 的三相电源上。这两种情况下,电源输入功率( )。
A.
差3倍
B.
相等
C.
差 倍
D.
差1/ 倍
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