求电阻容量
\u7535\u963b\u7684\u5927\u5c0f\u600e\u4e48\u8ba1\u7b97\u7535\u7ebf\u7684\u7535\u963b\u8ba1\u7b97\u516c\u5f0f\uff1f|\u7535\u7ebf\u8d8a\u7c97 \u7535\u963b\u8d8a\u5c0f \u7528\u7535\u8d8a\u5c11
2009-07-20 18:56
\u5982\u679c\u75284\u5e73\u65b9(mm)\u94dc\u7ebf,\u7ebf\u957f:200m.\uff08\u4e09\u76f8\u56db\u7ebf\uff09\u3002\u90a3\u4e4830\u65e5\u7ebf\u7684\u8017\u7535\u6709\u591a\u5c11?
6\u5e73\u65b9(mm)\u7684\u7ebf\u53c8\u662f\u591a\u5c11?
1\u5e73\u65b9\u6beb\u7c73\u7b49\u4e8e1/1000000 \u5e73\u65b9\u7c73\uff081\u5e73\u65b9\u6beb\u7c73=0.01\u5e73\u65b9\u5398\u7c73=0.0001\u5e73\u65b9\u5206\u7c73=0.000001\u5e73\u65b9\u7c73\uff0c1\u6beb\u7c73=1/1000\u7c73
1\u5e73\u65b9\u6beb\u7c73=1/(1000*1000)\u5e73\u65b9\u7c73 \uff09
\u7269\u4f53\u7535\u963b\u516c\u5f0f\uff1aR=\u03c1L/S
\u5f0f\u4e2d\uff1a
R\u4e3a\u7269\u4f53\u7684\u7535\u963b\uff08\u6b27\u59c6\uff09\uff1b
\u03c1\u4e3a\u7269\u8d28\u7684\u7535\u963b\u7387\uff0c\u5355\u4f4d\u4e3a\u6b27\u59c6\u7c73\uff08\u03a9. mm²/m)\u3002
L\u4e3a\u957f\u5ea6\uff0c\u5355\u4f4d\u4e3a\u7c73\uff08m\uff09
S\u4e3a\u622a\u9762\u79ef\uff0c\u5355\u4f4d\u4e3a\u5e73\u65b9\u7c73\uff08mm²\uff09
\u6b27\u59c6\u5b9a\u5f8b(I=U/R)
\u7535\u7ebf\u4e0a\u7684\u7535\u538b\u964d\u7b49\u4e8e\u7535\u7ebf\u4e2d\u7684\u7535\u6d41\u4e0e\u7535\u7ebf\u7535\u963b\u7684\u4e58\u79ef\uff08U=I*R\uff09
\u529f\u7387\u8ba1\u7b97\u516c\u5f0fP=U²/R\uff08U\u4ee3\u8868\u7535\u538b\u3001R\u4ee3\u8868\u7535\u963b\uff09
\uff08
\u7eaf\u94f6\u7ebf \u7684\u7535\u963b\u7387\u662f0.016 \u03a9.mm²/m\uff08\u6b27\u59c6\u7c73\uff09\uff0c
\u7eaf\u94dc\u7ebf\u57280\u2103\u65f6\u7684\u7535\u963b\u7387\u662f0.0175 \u03a9.mm²/m\uff08\u6b27\u59c6\u7c73\uff09\uff0c\u7535\u963b\u6e29\u5ea6\u7cfb\u6570\u662f0.00393/\u2103\u3002
\u7eaf\u94dd\u7ebf \u7684\u7535\u963b\u7387\u662f0.0283 \u03a9.mm²/m\uff08\u6b27\u59c6\u7c73\uff09\uff0c
\u03c1=\u03c1o(1+a*t)
\u5f0f\u4e2d \u03c1\u2014\u2014\u5728t\u6444\u6c0f\u5ea6\u65f6\u7684\u7535\u963b\u7387
\u03c1o\u2014\u2014\u57280\u2103\u65f6\u7684\u7535\u963b\u7387
t\u2014\u2014\u6e29\u5ea6
\u7eaf\u94dc\u7ebf\u572821\u2103\u5ea6\u65f6\u7684\u7535\u963b\u7387 =0.0175(1+0.00393*21)=0.0189 \u03a9.mm²/m
\uff09
R=0.0175X200/4=0.875\u6b27\u59c6 \uff08\u5230\u8fd9\u91cc\u4e00\u76f4\u90fd\u662f\u5bf9\u7684\uff09
-----------------------------------------------------------------------------------------------------------------
30\u65e5\u7684\u8017\u7535\u91cf\uff0c\u5982\u679c\u662f220V\u7684\u7535\u538b\uff0c\u90a3\u4e48\u5148\u8981\u6c42\u51fa\u529f\u7387
P=U²/R=220²/0.875=55.314W \uff08\u8fd9\u79cd\u72b6\u6001\u662f\u7535\u7ebf\u76f4\u63a5\u6784\u6210\u56de\u8def\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e0d\u63a5\u4efb\u4f55\u5bb6\u7528\u7535\u5668\u3002\u5982\u679c\u771f\u8fd9\u4e48\u505a\u7a7a\u5f00\u4f1a\u76f4\u63a5\u8df3\u95f8\uff01\uff09
55.314X30X24\u00f71000=39.826\u5ea6 \uff081\u5ea6\u7535=1\u5343\u74e6\u65f6
\u4f60\u7684\u6761\u4ef6\u4e0d\u591f\uff0c\u8fd9\u4e2a\u7535\u963b\u548c\u4f60\u7684\u7535\u6d41\u6709\u5173\uff0c\u800c\u4e14\u7535\u6d41\u662f\u5426\u53d8\u52a8\uff1f\u53ef\u80fd\u9020\u6210\u7535\u538b\u4e0d\u7a33\u3002
\u7ed9\u4f60\u4e00\u4e2a4.8V\u8f6c3.3V\u7684\u7535\u8def\uff0c\u7535\u6d411A\u4ee5\u4e0b\u90fd\u597d\u7528\uff0c\u6709\u7a33\u538b\u7684\u6548\u679c\u3002\u5e0c\u671b\u4f60\u80fd\u559c\u6b22\u3002
100千瓦
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