试题与答案

两个完全相同的电热器,分别通有如图所示的交变电流,则它们的功率之比为( ) A

题型:选择题

题目:

两个完全相同的电热器,分别通有如图所示的交变电流,则它们的功率之比为(   )

A.4:1

B.1:

C.2:1

D.:1

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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