图甲是在温度为10℃左右的环境中工作的某自动恒温箱原理简图，箱内的电阻R 1 ="20" kΩ,R 2 ="10" kΩ,R
\u56fe\u7532\u4e3a\u5728\u6e29\u5ea6\u4e3a10\u2103\u5de6\u53f3\u7684\u73af\u5883\u4e2d\u5de5\u4f5c\u7684\u67d0\u81ea\u52a8\u6052\u6e29\u7bb1\u539f\u7406\u7b80\u56fe\uff0c\u7bb1\u5185\u7684\u7535\u963bR 1 \uff1d20 k\u03a9\uff0cR 2 \uff1d10 k\u03a9\uff0cR11\u3001 35 20 k\u03a9 \u8bd5\u9898\u5206\u6790\uff1a\u7531\u9898\u610f\u5f97\uff1a\u5f53 a\u3001b\u7aef\u7535\u538b U ab \uff1c0\u65f6\uff0c\u7535\u538b\u9274\u522b\u5668\u4f1a\u4ee4\u5f00\u5173S\u63a5\u901a\uff0c\u6052\u6e29\u7bb1\u5185\u7684\u7535\u70ed\u4e1d\u53d1\u70ed\uff0c\u4f7f\u7bb1\u5185\u6e29\u5ea6\u63d0\u9ad8\uff1b\u5f53U ab \uff1e0\u65f6\uff0c\u7535\u538b\u9274\u522b\u5668\u4f7f S\u65ad\u5f00\uff0c\u505c\u6b62\u52a0\u70ed\uff0c\u5219\u5f53U ab =0\u65f6\uff0c\u6052\u6e29\u7bb1\u4fdd\u6301\u7a33\u5b9a\uff0c\u6839\u636e\u7535\u963b\u548c\u7535\u538b\u7684\u5173\u7cfb\u53ef\u4ee5\u6c42\u51faRt\u7684\u503c\uff0c\u6839\u636e\u4e59\u56fe\u5c31\u53ef\u4ee5\u77e5\u9053\u6e29\u5ea6\uff0e\u7531\u9898\u610f\u5f97\uff1a\u5f53U ab =0\u65f6\uff0c\u6052\u6e29\u7bb1\u4fdd\u6301\u7a33\u5b9a\uff0c\u6839\u636e\u4e32\u5e76\u8054\u7535\u8def\u7535\u538b\u4e0e\u7535\u963b\u7684\u5173\u7cfb\u53ef\u77e5\uff1aR 1 \uff1aR 2 =2\uff1a1 \u53ea\u6709 R 3 \uff1aR 4 \u4e5f\u4e3a2\uff1a1\u7684\u65f6\u5019\uff0cU ab =0\uff0c\u6b64\u65f6\u7535\u6865\u5e73\u8861\uff0e\u6240\u4ee5\u53ef\u77e5R t \u7535\u963b\u4e3a20k\u03a9\uff0c\u4ece\u56fe\u4e59\u53ef\u4ee5\u770b\u51fa\uff0c\u7535\u963b\u4e3a20k\u03a9\u65f6\uff0c\u6e29\u5ea6\u4e3a35\u6444\u6c0f\u5ea6\uff0e\u6545\u7b54\u6848\u4e3a\uff1a35\u2103\uff0c20 k\u03a9\u3002\u70b9\u8bc4\uff1a\u672c\u9898\u4e3b\u8981\u8003\u67e5\u4e86\u540c\u5b66\u4eec\u8bc6\u56fe\u80fd\u529b\u4ee5\u53ca\u5206\u6790\u95ee\u9898\u548c\u89e3\u51b3\u95ee\u9898\u7684\u80fd\u529b\uff0c\u8981\u80fd\u6839\u636e\u9898\u76ee\u7684\u610f\u601d\u5f97\u51fa\u5f53U ab =0\u65f6\uff0c\u6052\u6e29\u7bb1\u4fdd\u6301\u7a33\u5b9a\uff0e
35 \u2103 \u7531\u9898\u610f\u5f97\uff1a\u5f53U ab =0\u65f6\uff0c\u6052\u6e29\u7bb1\u4fdd\u6301\u7a33\u5b9a\uff0c\u6839\u636e\u4e32\u5e76\u8054\u7535\u8def\u7535\u538b\u4e0e\u7535\u963b\u7684\u5173\u7cfb\u53ef\u77e5\uff1aR 1 \uff1aR 2 =2\uff1a1 \u53ea\u6709 R 3 \uff1aR 4 \u4e5f\u4e3a2\uff1a1\u7684\u65f6\u5019\uff0cU ab =0\uff0c\u6b64\u65f6\u7535\u6865\u5e73\u8861\uff0e\u6240\u4ee5\u53ef\u77e5R t \u7535\u963b\u4e3a20k\u03a9\uff0c\u4ece\u56fe\u4e59\u53ef\u4ee5\u770b\u51fa\uff0c\u7535\u963b\u4e3a20k\u03a9\u65f6\uff0c\u6e29\u5ea6\u4e3a35\u6444\u6c0f\u5ea6\uff0e
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