如何用压敏电阻测试水压 有关北京理工大学应用物理的问题！
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\u3000
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\u3000\u3000\u6bd5\u4e1a\u540e\u4ece\u4e8b\u9700\u8981\u575a\u5b9e\u7684\u7269\u7406\u7406\u8bba\u57fa\u7840\u548c\u52a8\u624b\u80fd\u529b\u7684\u5de5\u4f5c\uff0c\u624e\u5b9e\u7684\u7406\u8bba\u77e5\u8bc6\u4ee5\u53ca\u5e94\u7528\u80fd\u529b\uff0c\u662f\u5f88\u591a\u4f01\u4e1a\u4efb\u4f55\u65f6\u5019\u90fd\u9700\u8981\u7684\u4eba\u624d\uff1a
\u3000\u3000\u6280\u672f\u5de5\u7a0b\u5e08\u2014\u2014\u4f01\u4e1a\u7684\u5de5\u7a0b\u6280\u672f\u5de5\u7a0b\u5e08\uff1b
\u3000\u3000\u6559\u5e08\u2014\u2014\u4ece\u4e8b\u5e94\u7528\u7269\u7406\u76f8\u5173\u6559\u80b2\u7684\u6559\u5e08\uff1b
\u3000\u3000\u53d1\u660e\u5bb6\u2014\u2014\u5e94\u7528\u7269\u7406\u4e13\u4e1a\u662f\u6700\u5bcc\u4ea7\u53d1\u660e\u5bb6\u7684\u5730\u65b9\u3002
采用伏安法测量电阻，由于待测电阻较大，采用电流表内接法，滑动变阻器采用分压式接法。
压敏电阻是一种限压型保护器件。利用压敏电阻的非线性特性，当过电压出现在压敏电阻的两极间，压敏电阻可以将电压钳位到一个相对固定的电压值，从而实现对后级电路的保护。压敏电阻的主要参数有：压敏电压、通流容量、结电容、响应时间等。
压敏电阻只考虑通流容量，通流能力大的压敏电阻，在吸收同样大小的浪涌电流时，应当有相对较小的残余压降，通流能力原则上和体积成正比。
压敏电阻是保护电路限电流的与水压没有关系
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