初四物理电学题：在热播剧《火蓝刀锋》中当剧中一伙人被困到岛上，他们想取火，可是只有一个手电，于是
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\u62c6\u4e00\u4e2a\u65e5\u5149\u706f\u4e0a\u7684\u5e9f\u65e7\u542f\u8f89\u5668\uff0c\u53d6\u4e0b\u5916\u58f3\uff0c\u8f7b\u8f7b\u7838\u53bb\u73bb\u7483\u7f69\uff0c\u5f97\u5230\u4e24\u4e2a\u8fde\u5728\u4e00\u8d77\u7684\u91d1\u5c5e\u7247\u3002
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\u628a\u90a3\u4e2a\u5f53\u5f00\u5173\u5c31\u884c\u4e86\u3002
\u5f53\u7136\u8fd8\u5f97\u6709\u4e2a\u5e9f\u65e7\u95e8\u94c3\uff0c\uff0c\u62ff\u4e2a\u706f\u793a\u610f\u4e0b\u4e5f\u884c... ran\u5a1f\u8981\u6c42\u4e0d\u9ad8\u3002
\u9898\u5e72\u4fe1\u606f\uff1a
1.\u9996\u5148\u9700\u8981\u4e86\u89e3\u5230\u7684\u662f\u7535\u538b\u8868\u5e76\u8054\u5230\u6ed1\u52a8\u53d8\u963b\u5668\u4e24\u7aef\uff0c\u5728\u7406\u60f3\u72b6\u6001\u4e0b\u7535\u538b\u8868\u663e\u793a\u7684\u662f\u7535\u8def\u4e2d\u52a0\u8f7d\u5728\u6ed1\u52a8\u53d8\u963b\u5668\u63a5\u5165\u90e8\u5206\u7535\u963b\u4e0a\u7684\u7535\u538b\uff1b
2.\u6839\u636e\u57fa\u5c14\u970d\u592b\u7535\u6d41\u5b9a\u5f8b\u53ef\u77e5\uff0c\u6b64\u65f6\u901a\u8fc7R\u548c\u6ed1\u52a8\u53d8\u963b\u5668\u63a5\u5165\u90e8\u5206\u7535\u963b\u7684\u7684\u7535\u6d41\u90fd\u4e3aI\uff1b
\u5206\u6790\uff1a
1.\u5f53\u7535\u538b\u8868\u793a\u6570\u4e3a9V\u65f6\uff0c\u901a\u8fc7\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u7535\u538b\u662f\u7535\u538b\u8868\u53d8\u52a8\u8303\u56f4\u7684\u6700\u5927\u503c\uff0c\u53ef\u77e5\u6ed1\u52a8\u53d8\u963b\u5668\u7535\u963b\u4e3a\u5b8c\u5168\u63a5\u5165\u72b6\u6001\uff0c\u6ed1\u52a8\u53d8\u963b\u5668\u7aef\u70b9\u4f4d\u4e8e\u6700\u4e0a\u7aef\uff0c\u6b64\u65f6\uff0c\u7535\u6d41\u5e94\u8be5\u5e94\u8be5\u6700\u5c0f\uff0c\u7531\u9898\u4e2d\u6240\u77e5\u4e3a1A\uff1b
2.\u5f53\u7535\u538b\u8868\u793a\u6570\u4e3a6V\u65f6\uff0c\u8fc7\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u7535\u538b\u662f\u7535\u538b\u8868\u53d8\u52a8\u8303\u56f4\u7684\u6700\u5c0f\u503c\uff0c\u53ef\u77e5\u6ed1\u52a8\u53d8\u963b\u5668\u7535\u963b\u4e3a\u5b8c\u5168\u672a\u63a5\u5165\u72b6\u6001\uff0c\u6ed1\u52a8\u53d8\u963b\u5668\u7aef\u70b9\u4f4d\u4e8e\u6700\u4e0b\u7aef\uff0c\u6b64\u65f6\uff0c\u7535\u6d41\u5e94\u8be5\u5e94\u8be5\u6700\u5927\uff0c\u7531\u9898\u4e2d\u6240\u77e5\u4e3a2A\uff1b
\u8ba1\u7b97\uff1a
1.\u8bbe\u6ed1\u52a8\u53d8\u963b\u5668\u6700\u5927\u963b\u503c\u4e3aRS\uff0c\u7535\u6e90\u7535\u538b\u4e3aE\uff0c\u7535\u538b\u8868\u793a\u6570\u4e3aU\uff0c\u7535\u6d41\u8868\u793a\u6570\u4e3aI\uff1b
2.\u5f53\u6ed1\u52a8\u53d8\u963b\u5668\u7aef\u70b9\u5728\u6700\u4e0a\u7aef\u65f6\uff0c\u53ef\u5f97\u65b9\u7a0b\uff08R+RS\uff09\u00d7 I1 = E \u2026\u2026\uff081\uff09
\u5176\u4e2d\uff0cI1=1A\uff0cU1=9V\uff0cRS=U1/I1=9V/1A=9\u03a9\uff0c\u5e26\u5165\uff081\uff09\u5f0f\u53ef\u5f97\uff08R+9\u03a9\uff09\u00d7 1A = E\u2026\u2026\uff082\uff09
3.\u5f53\u6ed1\u52a8\u53d8\u963b\u5668\u7aef\u70b9\u5728\u6700\u4e0b\u7aef\u65f6\uff0c\u53ef\u5f97\u65b9\u7a0bR \u00d7 I2 = E\u2026\u2026\uff083\uff09
\u5176\u4e2d\uff0cI2=2A\uff0c \u5e26\u5165\uff083\uff09\u5f0f\u53ef\u5f97R \u00d7 2A = E\u2026\u2026\uff084\uff09
3.\u7efc\u5408\uff082\uff09\u5f0f\u548c\uff084\uff09\u5f0f\u53ef\u5f97\u4e00\u4e2a2\u51431\u6b21\u65b9\u7a0b\u7ec4
R = E - 9
2R = E
\u53ef\u7b80\u5355\u89e3\u5f97E = 18V\uff0cR = 9\u03a9\uff1b
\u7efc\u4e0a\u6240\u8ff0\uff0c\u7535\u6e90\u7535\u538bE\u4e3a18V\uff0c\u7535\u963bR\u7684\u503c\u4e3a9\u03a9\uff1b
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\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff0c\u8c22\u8c22
其实基本不可能，你可以算算，电池电压一般三伏，电线其实也会有电阻，就算为0.1欧，则功率p=U^2/R也就100w，即1秒100焦，要知道水的比热容是4.2*10^3，即要使水上升一度要4200焦能量，就算木头只有十分之一比热，要达到着火点也基本不可能，你可以拿个导线连着电池试试，看看温度怎样，我试过了最多暖暖手，点着木棍基本不可能，电视剧夸张了
是的，因为电池短路是可以产生高温。甚至可以使电池爆炸。
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