【八年级物理】如图所示电路是在环境温度在10℃条件下工作的某自动恒温箱原理简图 如图所示电路是在环境温度在10℃条件下工作的某自动恒温箱原理...
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1) 25 \uff082\u5206\uff09
(2)\u5f53U1\uff1d2V\u5f00\u59cb\u52a0\u70ed\u65f6\uff0c
U2\uff1dU\uff0dU1\uff1d12V\uff0d2V\uff1d10V
\u7531\u56fe\u4e2d\u53ef\u67e5\u5f97\u6b64\u65f6\u7684\u73af\u5883\u6e29\u5ea6\u4e3a15\u2103\uff0c\u6b64\u5373\u6052\u6e29\u7bb1\u7684\u6700\u4f4e\u6e29\u5ea6\uff1b \uff082\u5206\uff09
\u5f53U1\uff1d4V\u65f6\uff0c
U2\uff1dU\uff0dU1\uff1d12V\uff0d4V\uff1d8V
\u7531\u56fe\u4e2d\u53ef\u67e5\u5f97\u6b64\u65f6\u7684\u73af\u5883\u6e29\u5ea6\u4e3a50\u2103\uff0c\u6b64\u5373\u6052\u6e29\u7bb1\u7684\u6700\u9ad8\u6e29\u5ea6\uff1b \uff082\u5206\uff09
\u6240\u4ee5\u6b64\u6052\u6e29\u7bb1\u7684\u6e29\u5ea6\u5c06\u4fdd\u6301\u572815\u2103\uff5e50\u2103\u7684\u8303\u56f4\u3002 \uff081\u5206\uff09
(3)\u53ef\u589e\u52a0R1\u7684\u7535\u963b\u503c\u6216\u589e\u5927\u7535\u6e90\u7684\u7535\u538b\u3002
1、Uab<2，接通，此时：R2>25千欧
2、Uab>4,断开，此时：R2<10千欧
根据温度变化的图线就可以判断出温度范围，单从你的表格上读的话第一题是25千欧，那温度范围是：15-50摄氏度
观察表格可以看出R2阻值越高，温度变化范围越小，而且R1不用数据代入得到R2<2R1时断开，R2>5R1时接通，那么适当增加R1的值就能使温度变化范围减小。
想知道什么！ 热敏电阻在10Ω～25Ω之间为加热器工作区间。
1）25kΩ
2）15℃-50℃
3）AB间串联一个2KΩ的电阻
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