二十五平方铜线有多粗 电线截面25平方毫米直径为多少？

\u4e8c\u5341\u4e94\u5e73\u65b9\u7535\u7ebf\u80fd\u5e26\u591a\u5c11\u5343\u74e6

1.25\u5e73\u65b9\u5982\u679c\u662f\u94dc\u7ebf \u5b83\u7684\u622a\u6d41\u91cf\u662f109A\uff0c\u5355\u76f8\u7535\u53ef\u5e26220V\u00d7109A=23.9\u5343\u74e6\uff0c\u5982\u679c\u662f\u5bf9\u79f0\u4e09\u76f8\u53ef\u5e2660.9\u5343\u74e6\u3002
2.25\u5e73\u65b9\u7684\u94dd\u82af\u7535\u7ebf\u5b89\u5168\u8f7d\u6d41\u91cf\u662f105A\u3002\u5355\u76f8\u8d1f\u8f7d\u80fd\u5e26\u7684\u529f\u7387\u662f\uff1aP\uff1dUICos\u03c6=220\u00d7105\u00d70.85=19.6Kw,\u4e09\u76f8\u8d1f\u8f7d\u80fd\u5e26\u7684\u529f\u7387\u662f\uff1aP=UI\u221a3Cos\u03c6=380\u00d7105\u00d71.732\u00d70.85=58.7Kw
\u5343\u74e6(Kilowatt)\uff0c\u65e9\u671f\u4e3a\u7535\u7684\u529f\u7387\u5355\u4f4d\uff0c\u73b0\u5728\u6709\u5ef6\u4f38\u4e3a\u6574\u4e2a\u7269\u7406\u5b66\u9886\u57df\u529f\u7387\u5355\u4f4d\u7684\u8d8b\u52bf\u3002\u5728\u7535\u5b66\u4e0a\uff0c\u5343\u74e6\u65f6(Kilowatt-hour)\u4e0e\u5ea6\u5b8c\u5168\u76f8\u7b49\uff0c\u53ea\u662f\u79f0\u8c13\u4e0d\u540c\u3002
\u5343\u74e6\u4e0e\u5176\u4ed6\u5355\u4f4d\u7684\u6362\u7b97\uff1a
1 \u5343\u74e6 = 1000 \u74e6\u7279(Watt) = 1000 \u7126\u8033(Joule)/\u79d2(Second)
1 \u5343\u74e6 = 1000 \u725b\u987f\u00b7\u7c73/\u79d2(N\u00b7m/s)
1 \u5343\u74e6 = 0.239\u5343\u5361/\u79d2(kcal/s)
1 \u5343\u74e6 = 1.36 \u9a6c\u529b

2.5\u5e73\u65b9\u6beb\u7c73\u7684\u56fd\u6807\u7535\u7ebf\u76f4\u5f84\u662f1.785\u6beb\u7c73
\u56fd\u6807\u7535\u7ebf\u4e00\u822c\u8981\u6c42\u76f4\u6d41\u7535\u963b\u7b26\u5408\u6807\u51c6\u8981\u6c42\uff0c\u5b9e\u9645\u5916\u5f84\u8fbe\u52301.75mm\u5c31\u80fd\u7b26\u5408\u56fd\u6807\u76f4\u6d41\u7535\u963b\u8981\u6c42\u3002
\u56fd\u6807\u7535\u7ebf\uff1a\u5c31\u662f\u5b8c\u5168\u6309\u7167\u56fd\u6807\u6765\u751f\u4ea7\u7684\u7535\u7ebf\u3002\u4e00\u822c\u5bb6\u7528\u3001\u5e38\u89c1\u7684\u7535\u7ebf\u90fd\u662f\u56fd\u5bb6\u6807\u51c6\u89c4\u683c\u6027\u80fd\u7684\uff0c\u56fd\u6807\u5728\u7535\u7ebf\u7684\u5916\u89c2\u6807\u51c6\u3001\u673a\u68b0\u5f3a\u5ea6\u3001\u62a4\u5957\u7684\u7edd\u7f18\u3001\u7ebf\u963b\u3001\u9ad8\u4f4e\u6e29\u51b2\u51fb\u7b49\u65b9\u9762\u6709\u5177\u4f53\u7684\u89c4\u5b9a\u3002
\u5e73\u65b9\uff1a\u6307\u7535\u7ebf\u7684\u6a2a\u622a\u9762\u79ef\uff0c\u4e00\u822c\u5355\u4f4d\u662f\u5e73\u65b9\u6beb\u7c73\u3002
\u6839\u636e\u5706\u9762\u79ef\u7684\u8ba1\u7b97\u516c\u5f0f\uff0c\u03c0r²=2.5
r²=2.5/3.14=0.7962
r=\u221a0.7962=0.8925
2r=1.785

\u6269\u5c55\u8d44\u6599\uff1a

\u7535\u7ebf\u7684\u9009\u62e9\u6807\u51c6
1\u3001\u9009\u94dc\u82af\u7535\u7ebf\uff1a\u7535\u7ebf\u7535\u7ebf\uff0c\u9996\u5148\u8981\u5230\u5bfc\u7535\u6027\u80fd\u597d\u3002\u5e02\u9762\u4e0a\u6709\u94dc\u82af\u7535\u7ebf\u548c\u5176\u4ed6\u7535\u7ebf\u3002\u94dc\u82af\u7535\u7ebf\u662f\u5ba4\u5185\u88c5\u4fee\u5b9e\u7528\u6700\u591a\u7684\u4e00\u79cd\u3002\u4e0d\u8fc7\u94dc\u82af\u7535\u7ebf\u53c8\u5206\u4e3a\u51e0\u79cd\uff0c\u6709\u5927\u534a\u5f84\u94dc\u82af\u548c\u591a\u7ebf\u94dc\u82af\u3002
2\u3001\u8d1f\u8f7d\u80fd\u529b\u5f3a\u7684\u7535\u7ebf\uff1a\u5bb6\u5ead\u4e2d\u7684\u7528\u7535\u91cf\u65f6\u5927\u65f6\u5c0f\uff0c\u6700\u5927\u7684\u65f6\u5019\u6211\u4eec\u4f1a\u5f00\u7740\u7535\u89c6\uff0c\u5f00\u7740\u7a7a\u8c03\uff0c\u5f00\u7740\u7535\u8111\uff0c\u5f00\u7740\u706f\uff0c\u5f00\u7740\u996e\u6c34\u673a\uff0c\u51b0\u7bb1\uff0c\u5439\u98ce\u7b49\u3002\u5982\u679c\u7535\u7ebf\u7684\u8d1f\u8f7d\u80fd\u529b\u4e0d\u5f3a\u7684\u8bdd\uff0c\u53c8\u52a0\u4e0a\u708e\u70ed\u7684\u590f\u5929\uff0c\u5f88\u5bb9\u6613\u4f1a\u8ba9\u7535\u7ebf\u56e0\u4e3a\u9ad8\u6e29\u800c\u71c3\u70e7\uff0c\u5bfc\u81f4\u706b\u707e\u3002
3\u3001\u9632\u6c34\u6027\u80fd\u597d\u3002\u6709\u7684\u7535\u7ebf\u5916\u8868\u5f88\u5bb9\u6613\u53d8\u5f62\u88c2\u53e3\uff0c\u4e07\u4e00\u67d0\u5904\u51fa\u73b0\u6f0f\u6c34\uff0c\u90a3\u4e48\u5c31\u4f1a\u5bfc\u81f4\u7535\u5668\u70e7\u574f\uff0c\u77ed\u8def\u751a\u81f3\u5f15\u53d1\u706b\u707e\u548c\u4eba\u5458\u4f24\u4ea1\u3002\u6240\u4ee5\u4e00\u5b9a\u8981\u5916\u76ae\u575a\u786c\uff0c\u9632\u6c34\u6027\u80fd\u597d\u7684\u7535\u7ebf\u3002
4\u3001\u4e3b\u7ebf\u4e00\u5b9a\u8981\u662f\u7c97\u82af\u3002\u6240\u8c13\u4e3b\u7ebf\u5c31\u662f\u6307\u603b\u7535\u6e90\u5230\u6240\u6709\u7535\u5668\u4e4b\u95f4\u7684\u62ff2\u6761\u4e3b\u5bfc\u7ebf\u3002\u4e3b\u7ebf\u6bd4\u5fc5\u987b\u7528\u7c97\u94dc\u82af\u7ebf\u7684\uff0c\u56e0\u4e3a\u4e3b\u7ebf\u8d1f\u8f7d\u7740\u5404\u4e2a\u7535\u5668\u7684\u7535\u8377\u91cf\uff0c\u9700\u8981\u6027\u80fd\u5353\u8d8a\u7684\u7c97\u94dc\u7ebf\u3002\u65c1\u8def\u53ef\u4ee5\u9009\u62e9\u591a\u82af\u7ebf\u3002
\u4e0e\u5706\u76f8\u5173\u7684\u516c\u5f0f\uff1a
1\u3001\u5706\u9762\u79ef\uff1aS=\u03c0r²\uff0cS=\u03c0(d/2)²\u3002\uff08d\u4e3a\u76f4\u5f84\uff0cr\u4e3a\u534a\u5f84\uff09\u3002
2\u3001\u534a\u5706\u7684\u9762\u79ef\uff1aS\u534a\u5706=(\u03c0r^2)/2\u3002\uff08r\u4e3a\u534a\u5f84\uff09\u3002
3\u3001\u5706\u73af\u9762\u79ef\uff1aS\u5927\u5706-S\u5c0f\u5706=\u03c0(R^2-r^2)(R\u4e3a\u5927\u5706\u534a\u5f84\uff0cr\u4e3a\u5c0f\u5706\u534a\u5f84)\u3002
4\u3001\u5706\u7684\u5468\u957f\uff1aC=2\u03c0r\u6216c=\u03c0d\u3002\uff08d\u4e3a\u76f4\u5f84\uff0cr\u4e3a\u534a\u5f84\uff09\u3002
5\u3001\u534a\u5706\u7684\u5468\u957f\uff1ad+(\u03c0d)/2\u6216\u8005d+\u03c0r\u3002\uff08d\u4e3a\u76f4\u5f84\uff0cr\u4e3a\u534a\u5f84\uff09\u3002

二十五平方铜线
是指截面积=25平方毫米
25=πd²÷4
d=√（100÷3.14）
d≈5.643毫米
就是直径为5.643毫米的铜线。

二十五平方铜线 线径约 5.6mm

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