如图所示，甲、乙两图中各对应的同种仪器规格都相同，其中固定电阻R=100Ω，滑动变阻器W的最大阻值为50Ω
\u5982\u56fe\u6240\u793a\uff0c\u7532\u3001\u4e59\u4e24\u56fe\u4e2d\u5404\u5bf9\u5e94\u7684\u540c\u79cd\u4eea\u5668\u89c4\u683c\u90fd\u76f8\u540c\uff0c\u5176\u4e2d\u56fa\u5b9a\u7535\u963bR=100\u03a9\uff0c\u6ed1\u52a8\u53d8\u963b\u5668W\u7684\u6700\u5927\u963b\u503c\u4e3a50\u03a9\u7535\u6e90\u7684\u5185\u963b\u4e0d\u8ba1\u65f6\uff0c\u8def\u7aef\u7535\u538b\u7b49\u4e8e\u7535\u52a8\u52bf\uff0c\u5373U=6V\uff0c\u4fdd\u6301\u4e0d\u53d8\uff0eA\u3001\u7532\u56fe\u4e2d\uff0c\u53d8\u963b\u5668\u4e0eR\u5e76\u8054\uff0c\u5e76\u8054\u7535\u8def\u7684\u7535\u538b\u7b49\u4e8e\u8def\u7aef\u7535\u538b\uff0c\u6240\u4ee5\u7535\u538b\u8868V 1 \u7684\u793a\u6570\u53d8\u5316\u8303\u56f4\u4e3a0\uff5e6V\uff0e\u6545A\u6b63\u786e\uff0eB\u3001\u4e59\u56fe\u4e2d\uff0c\u53d8\u963b\u5668\u4e0eR\u4e32\u8054\uff0cR\u7684\u6700\u5927\u7535\u538b\u5c0f\u4e8e6V\uff0c\u5219\u7535\u538b\u8868V 2 \u7684\u793a\u6570\u53d8\u5316\u8303\u56f4\u5c0f\u4e8e0\uff5e6V\uff0e\u6545B\u9519\u8bef\uff0eC\u3001\u7532\u56fe\u4e2d\u7535\u6d41\u65b9\u5411\u6cbf\u987a\u65f6\u9488\u65b9\u5411\uff0c\u7535\u538b\u8868\u7684a\u63a5\u7ebf\u67f1\u4e0a\u5e94\u6807\u7740\u201c+\u201d\u53f7\uff0e\u6545C\u6b63\u786e\uff0eD\u3001\u4e59\u56fe\u4e2d\u7535\u6d41\u65b9\u5411\u6cbf\u987a\u65f6\u9488\u65b9\u5411\uff0c\u7535\u538b\u8868\u7684a\u63a5\u7ebf\u67f1\u4e0a\u5e94\u6807\u7740\u201c+\u201d\u53f7\uff0cb\u63a5\u7ebf\u67f1\u4e0a\u6807\u7740\u201c-\u201d\u53f7\uff0e\u6545D\u6b63\u786e\uff0e\u672c\u9898\u9009\u9519\u8bef\u7684\uff0c\u6545\u9009B
\u7532\u56fe\u4e3a\u5206\u538b\u5f0f\u63a5\u6cd5\uff0c\u7535\u538b\u53ef\u75310\u5230E\u4e4b\u95f4\u53d8\u5316\uff0c\u800c\u4e59\u56fe\u4e3a\u9650\u6d41\u5f0f\u63a5\u6cd5\uff0c\u7535\u538b\u4e0d\u80fd\u75310\u5f00\u59cb\u53d8\u5316\uff0c \u5f53P\u5728\u53f3\u7aef\u65f6\uff0c\u7532\u56feR x \u4e0eR\u5e76\u8054\uff1aP= E 2 RR x R+R X = 6 2 20R x 20+R X \u4e59\u56feR x \u5de5\u4f5c\uff1aP\u2032= E 2 R X = 36 20 \u5219 P P\u2032 =3\uff1a1\u89e3\u5f97\uff1aR X =40\u03a9\u6545\u7b54\u6848\u4e3a\uff1a\u7532 40\u03a9
电源的内阻不计时，路端电压等于电动势，即U=6V，保持不变．A、甲图中，变阻器与R并联，并联电路的电压等于路端电压，所以电压表V1的示数变化范围为0～6V．故A正确．
B、乙图中，变阻器与R串联，R的最大电压小于6V，则电压表V2的示数变化范围小于0～6V．故B错误．
C、甲图中电流方向沿顺时针方向，电压表的a接线柱上应标着“+”号．故C正确．
D、乙图中电流方向沿顺时针方向，电压表的a接线柱上应标着“+”号，b接线柱上标着“-”号．故D正确．
本题选错误的，故选B
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