题干

一理想变压器的原、副线圈的匝数比为3:1,在原、副线圈的回路中分别接有阻值相同的电阻,原线圈一侧接在电压为220V的正弦交流电源上,如图所示。设副线圈回路中电阻两端的电压为U,原、副线圈回路中电阻消耗的功率的比值为k,则(    )

A:U=66V,  K=19

B:U=22V, K=19

C:U=66V,  K=13

D:U=22V, K=13

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答案(点此获取答案解析)

A

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