四个阻值为r的电阻串联，其等效电阻值为多少r 四个阻值为r的电阻全部使用
\u56db\u4e2a\u963b\u503c\u4e3aR\u7684\u7535\u963b\uff0c\u53ef\u7ecf\u8fc7\u9002\u5f53\u7684\u8fde\u63a5\uff0c\u4f7f\u5176\u7b49\u6548\u7535\u963b\u503c\u4ecd\u4e3aR?\u6bd4\u59824\u4e2a\u7535\u963b\u90fd\u662f8\u6b27\u59c6\u3002\u5148\u6bcf\u4e24\u4e2a\u5e76\u8054\u5728\u4e00\u8d77\uff0c\u5219\u5e76\u8054\u540e\u7684\u963b\u503c\u4e3a4\u6b27\u59c6; \u7136\u540e\u518d\u4e32\u8054\u5728\u4e00\u8d77\uff0c\u4e24\u4e2a4\u6b27\u59c6\u7684\u7535\u963b\u4e32\u8054\u7684\u963b\u503c\u4e3a8\u6b27\u59c6\u3002
A
4\u4e2a\u4e32\u662f4R 2\u4e2a2\u4e2a\u5148\u4e32\u518d\u5e76\u662fR 2\u4e2a2\u4e2a\u5148\u5e76\u518d\u4e32\u4e5f\u662fR 2\u4e2a\u4e32\u662f2R
C\u4e5f\u53ef\u5f97\u5230,D\u6ca1\u6cd5\u5f97\u5230
r+r+r+r=4r
并联：
1/(1/r+1/r+1/r+1/r)=r/4
就是4倍r啊
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