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如图所示，一台有两个副线圈的变压器，原线圈匝数n 1 =1100，接入电压U 1 =220V的电路中，（1）要求在两
如图所示，一台有两个副线圈的变压器，原线圈匝数n 1 =1100，接入电压U 1 =220V的电路中，（1）要求在两
2025-03-15 07:37:43
推荐回答（1个）
回答1：
（1）变压器电压比等于匝数比
U
1
n
1
=
U
2
n
2
=
U
3
n
3
，有
220
1100
=
6
n
2
=
110
n
3
所以n
2
=30匝，n
3
=550匝．
（2）两组副线圈上电压分别为U
2
=6V，U
3
=110V，在两副线圈上分别接上“6V，20W”、“110V，60W”的两个用电器时，这两个用电器都能正常工作，所以这两个用电器实际消耗的功率就为20W和60W．
又因为理想变压器的输入功率等于输出功率，所以P
1
=P
2
+P
3
．
即I
1
?U
1
=20W+60W=80W，因为U
1
=220V，所以I
1
=0.36A
答：（1）两个副线圈的匝数分别为n
2
=30匝，n
3
=550匝．
（2）原线圈的输入电流为0.36A．
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