热敏电阻包括正温度系数电阻器（PTC）和负温度系数电阻器（NTC）．正温度系数电阻器（PTC）在温度升高时 热敏电阻常常应用在控制电路中，热敏电阻包括正温度系数电阻器（...

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\uff081\uff09C \uff082\uff09\u89c1\u89e3\u6790 \uff083\uff09PTC \uff084\uff099.6\u201410.4v 6.0\u20148.0\u03a9 \u8bd5\u9898\u5206\u6790\uff1a\uff081\uff09\u8981\u4f7f\u52a0\u5728\u70ed\u654f\u7535\u963b\u4e24\u7aef\u7684\u7535\u538b\u4ece\u96f6\u5f00\u59cb\u9010\u6e10\u589e\u5927\uff0c\u5219\u5fc5\u987b\u7528\u5206\u538b\u7535\u8def\uff0c\u6545\u6ed1\u52a8\u53d8\u963b\u5668\u5e94\u8be5\u9009\u7528\u963b\u503c\u8f83\u5c0f\u7684C;\uff082\uff09\u7535\u8def\u5982\u56fe\u6240\u793a\uff1a \uff1b\u6545\u91c7\u7528\u5b89\u57f9\u8868\u5916\u63a5\u7535\u8def\uff1b (4)\u7531\u56fe\u50cf\u53ef\u77e5\u66f2\u7ebfI \u8868\u793a\u7684\u7535\u963b\u968f\u7740\u7535\u538b\u7684\u589e\u5927\u963b\u503c\u589e\u5927\uff0c\u5373\u968f\u7740\u6e29\u5ea6\u7684\u589e\u5927\u963b\u503c\u589e\u5927\uff0c\u6240\u4ee5\u662f\u6b63\u6e29\u5ea6\u7cfb\u6570\u7535\u963bPTC\uff1b(3)\u5bf9\u4e8e\u7535\u963bR 1 \uff0cI 1 =0.3A\uff0cU 1 =8V\uff1b\u5bf9\u4e8e\u7535\u963bR 2 \uff0cI 2 =0.6A\uff0cU 2 =6V\uff1b\u5219\u6839\u636e\u6b27\u59c6\u5b9a\u5f8b\uff1aE=U 1 +I 1 r\uff1bE=U 2 +I 2 r\uff1b\u5373E=8+0.3r\uff1bE=6+0.6r\uff1b\u8054\u7acb\u89e3\u5f97\uff1aE=10.0V\uff1br=6.67\u03a9

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①：由于实验要求电压从零调，所以变阻器应采用分压式接法，应选择阻值小的变阻器E以方便调节；
根据电源电动势为15V可知电压表应选D；
电压表的最小电压应为量程的

1

3

即5V，常温下热敏电阻的电阻为10Ω，所以通过热敏电阻的最小电流应为

I

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