题目内容
如图表示一交流电随时间而变化的图象,此交流电的有效值是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/201406110943450693532.png)
A.3.5A | B.
| C.5
| D.5A |
![](http://thumb.1010pic.com/pic2/upload/papers/20140611/201406110943450693532.png)
由有效值的定义可得:
I12Rt1+I22Rt2=I2RT,
代入数据得(4
)2R
+(3
)2R
=I2RT
解得:I=5A
故选:D.
I12Rt1+I22Rt2=I2RT,
代入数据得(4
2 |
T |
2 |
2 |
T |
2 |
解得:I=5A
故选:D.
![](http://thumb2018.1010pic.com/images/loading.gif)
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