题目内容
某交变电流的电压随时间的变化规律如图所示,则此交变电流的频率为 ,如将该电压加在10μF的电容器上,则电容器的耐压值不应小于 。 如将该电压加在一阻值为1kΩ的纯电阻用电器上,用电器恰能正常工作,为避意外,该电路中保险丝的额定电流不能低于 ,如将该电压加在辉光电压(电压达到或高于该电压值,氖管才会发光。)为100V的氖管上,则每分钟内氖管发光时间为 。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241718099522340.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241718099522340.png)
50Hz; 200 v; 0.14A; 40s
试题分析:跟据图像可知,周期为0.02s,则此交流电的频率是
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171810186721.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241718106391141.png)
根据公式
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171810873727.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171811278808.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171811668566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241718120901038.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171812511811.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824171812885694.png)
点评:本题的最后一问难度比较大,关键是判断该氖管在1个周期内的发光时间
![](http://thumb2018.1010pic.com/images/loading.gif)
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