图1所示变压器，原方N1=300匝，副方N2=100匝，R=8Ω，则从原方看入的电阻Ri是（）。图2-1

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国家开放大学 / 电工电子技术

图1所示变压器，原方N₁=300匝，副方N₂=100匝，R=8Ω，则从原方看入的电阻R_i是（）。

图2-1

A.
8Ω

B.
72Ω

C.
24Ω

D.
36Ω

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电工电子技术

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