已知R1=R2=R3=R4=R5=1欧姆，请计算A.B点间的等效电阻Rab等于多少？ 计算图1电路中a、b两端的等效电阻Rab，有具体步骤吗？谢谢...

\u5df2\u77e5R1=R2=R3=3\u03a9\uff0cR4=R5=6\u03a9\uff0c\u8bd5\u6c42\u56fe\u4e2d\u7684\u7b49\u6548\u7535\u963bRab

Rab = 7\u03a9
\u7535\u8def\u4eff\u771f\u7ed3\u679c\u5982\u4e0b\u56fe\uff1aRab = 7V / 1A = 7\u03a9

\u7535\u8def\u5206\u6790\u5982\u4e0b\uff1a
1\uff0c\u9996\u5148R4 \u88ab\u53f3\u8fb9\u7684\u7ebf\u8def\u7ed9\u77ed\u8def\u4e86\uff0c\u90a3\u4e48\u628aR4 \u6362\u6210\u5bfc\u7ebf\uff0c\u7535\u8def\u5c31\u53d8\u5982\u4e0b\u4e86\uff1a

2\uff0c \u518d\u628a\u7535\u8def\u7b80\u5316\u4e0b\uff0c\u540c\u7535\u4f4d\u7684\u8fde\u6210\u4e00\u70b9\uff1a

3\uff0c\u8fd9\u6837\u7535\u8def\u5c31\u5f88\u6e05\u6670\u4e86\uff0cRab = \uff08R1//R2//R3) + R5 = 1+ 6 = 7\u03a9
\u53ef\u4ee5\u5173\u6ce8\u4e0b\u6211\u7684\u516c\u4f17\u53f7\uff1a\u5c0f\u563f\u4f83\u7535\u5b50\uff0c\u5e73\u65f6\u6211\u4f1a\u5206\u4eab\u7535\u8def\u8bbe\u8ba1\u7684\u77e5\u8bc6\u3002

\u8fd9\u79cd\u7b80\u5355\u7684\u7535\u8def\uff0c\u53ea\u8981\u91cd\u65b0\u753b\u4e00\u4e0b\uff0c\u5c31\u53ef\u4ee5\u660e\u767d\u5404\u7535\u963b\u4e4b\u95f4\u7684\u5173\u7cfb\u4e86\u3002
\u4e0a\u8ff0\u7535\u8def\u4e2d\uff0cab\u4e24\u70b9\u4e4b\u95f4\u63a5\u670910\u03a9\u7535\u963b\uff0c\u540c\u65f6\u4e24\u4e2a6\u03a9\u7535\u963b\u5e76\u8054\u4e4b\u540e\u518d\u4e0e7\u03a9\u7535\u963b\u4e32\u8054\uff0c\u4e5f\u63a5\u5728ab\u4e4b\u95f4\u3002\u6240\u4ee5\uff0cab\u4e4b\u95f4\u7684\u7535\u963bRab\u5c31\u662f10\u03a9\u7535\u963b\u4e0e\u4e24\u5916\u4e00\u4e2a\u7ec4\u5408\u7535\u963b\u7684\u5e76\u8054\uff0c\u8fd9\u4e2a\u7ec4\u5408\u7535\u963b\u662f\u7531\u4e24\u4e2a6\u03a9\u7535\u963b\u5e76\u8054\u540e\u518d\u4e0e7\u03a9\u7535\u963b\u4e32\u8054\u540e\u5f97\u5230\u7684\u3002
Rab = 10//(6//6+7)
= 10//(3+7)
= 10//10
= 5 (\u03a9)
\u5373\uff0c\u56fe\u4e00\u7535\u8def\u4e2d\uff0cab\u4e24\u7aef\u7684\u7b49\u6548\u7535\u963bRab\u7b49\u4e8e5\u6b27\u59c6\u3002

本题的等效电路图如下：

由图可知：R3，R4串联，则R3 +   R4   =2 欧姆，它和R5并联得2/3欧姆，然后，这个电阻再和R2串联，得到的电阻是5/3欧姆，  最后，相当于5/3欧姆的电阻和R1并联。所以Rab=5/8欧姆。

等效电阻等于R3串R4并R5后串R2后再与R1并联的值5/8

R3+R4=2欧 并R5后为2/3欧，串R2后为5/3欧，再并上R1等于5/8欧

上图的等效电路如下：

等效电阻：Rab＝R1//(R2＋R5//(R3＋R4))＝5/8欧。

Rab=1.4欧

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宸茬煡R1=R2=R3=R4=R5=1Ω,姹俁AB
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