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【简答题】
一台单相变压器U 1N /U 2N =220V/110V，一次绕组为U 1 U 2 ，二次绕组为u 1 u 2 。U 1 u 1 为同名端，当一次侧绕组U 1 U 2 加上额定电压时，空载电流I 0 ，主磁通Φ 0 。如果把U 2 与u 1 联接在一起，在U 1 u 2 间加330V电压，此时励磁电流和主磁通各为多大?若把U 2 与u 2 联在一起，在U 1 u 1 间加110V电压，励磁电流及主磁通又各为多大?
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