题目内容
通过一阻值为R=100Ω的电阻的交变电流如图所示,其周期为1s.电阻两端电压的有效值为______V.
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102159309915247.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102159309915247.png)
由有效值的定义可得:
I12Rt1+I22Rt2=
T,
代入数据得:(0.1)2R×0.8+(0.2)2×R×0.2=
×1,
解得:U=4
V
故答案为:4
.
I12Rt1+I22Rt2=
U2 |
R |
代入数据得:(0.1)2R×0.8+(0.2)2×R×0.2=
U2 |
R |
解得:U=4
10 |
故答案为:4
10 |
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