如图11所示理想变压器原副线圈的匝数比n1∶n2=4∶1,原线圈输入电压

如图11所示理想变压器原副线圈的匝数比n1∶n2=4∶1,原线圈输入电压U1=1 410sin100πt V,副线圈通过电阻R=1 Ω的输电线对用户供电.则用户处最多接_________盏“220 V 40 W”电灯可保证正常发光.

图11

答案

解析:原线圈输出电压U1=V=1 000 V

=得副线圈两端电压U2=U1=250 V,

因用户处电压为220 V,所以线圈回路中线路上损失电压U线=30 V,所以副线圈回路中电流I2==30 A,用户处所接电灯N==165(盏).

答案:165

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