Question

11£®£¨1£©Ä³Í¬Ñ§Ïë²âÁ¿Ò»½ðÊôµ¼ÌåµÄµç×èÂÊ£¬ÏÈÓöàÓõç±í´Ö²âÆäµç×裮ËûÑ¡ÔñR¡Á1¦¸µÄ±¶ÂÊ£¬ÕýÈ·²Ù×÷ºóÖ¸ÕëÖ¸ÔÚͼ1ËùʾλÖã¬R_xµÄ²âÁ¿ÖµÎª22¦¸£»
£¨2£©½Ó×ÅËûÓÃÂÝÐý²â΢Æ÷²âÁ¿³öÆäÖ±¾¶£¬Èçͼ2Ëùʾ£¬ÔòÖ±¾¶d=2.150mm£»
£¨3£©Óÿ̶ȳ߲âÁ¿³ö³¤¶ÈΪL£»
£¨4£©ÎªÁË׼ȷ²âÁ¿³öµç×裬¸ÃͬѧÕÒµ½Á˵çÔ´£¨4V£¬ÄÚ×è¿É²»¼Æ£©¡¢»¬¶¯±ä×èÆ÷£¨0-50¦¸£¬¶î¶¨µçÁ÷2A£©¡¢¿ª¹ØºÍµ¼ÏßÈô¸É£¬ÒÔ¼°ÏÂÁеç±í£º
A£®µçÁ÷±í£¨0-3A£¬ÄÚ×èÔ¼0.025¦¸£©
B£®µçÁ÷±í£¨0-0.6A£¬ÄÚ×èÔ¼0.125¦¸£©
C£®µçѹ±í£¨0-3V£¬ÄÚ×èÔ¼3k¦¸£©
D£®µçѹ±í£¨0-15V£¬ÄÚ×èÔ¼15k¦¸£©
Ϊ¼õС²âÁ¿Îó²î£¬ÔÚʵÑéÖУ¬µçÁ÷±íºÍµçѹ±íӦѡÓÃCB£¨Ñ¡ÌîÆ÷²ÄÇ°µÄ×Öĸ£©£»ÊµÑéµç·Ӧ²ÉÓÃͼ3ÖеÄÒÒ£¨Ìî¡°¼×¡±»ò¡°ÒÒ¡±£©
£¨5£©Èç¹ûµçѹ±íµÄ¶ÁÊýΪU£¬µçÁ÷±íµÄ¶ÁÊýΪI£¬Ôò¸Ã½ðÊôµÄµç×èÂÊ=$\frac{¦ÐU{d}^{2}}{4IL}$£¨ÓÃ×Öĸ±íʾ£©£®

Answer 1

·ÖÎö £¨1£©¸ù¾Ýͼ1Ö±½Ó¶ÁÊý£»
£¨2£©ÂÝÐý²â΢Æ÷¶ÁÊýÓ¦¸ÃΪ£º¹Ì¶¨¿Ì¶È¶ÁÊý+°ë¿Ì¶È¶ÁÊý+¿É¶¯¿Ì¶È¶ÁÊý
£¨3£©ºÏÀíÑ¡ÔñʵÑéÆ÷²Ä£¬ÏÈÑ¡±ØÒªÆ÷²Ä£¬ÔÙ¸ù¾ÝÒªÇóÂú×㰲ȫÐÔ£¬×¼È·ÐÔ£¬·½±ã²Ù×÷µÄÔ­ÔòÑ¡Ôñ´ýÑ¡Æ÷²Ä£®µçÁ÷±íµÄ½Ó·¨ÒªÇó´óµç×èÄÚ½Ó·¨£¬Ð¡µç×èÍâ½Ó·¨£»
£¨4£©¸ù¾ÝÅ·Ä·¶¨Âɺ͵ç×趨ÂÉÇó½â£®

½â´ð ½â£º£¨1£©¸ù¾Ýͼ1¿ÉÖª£¬R_xµÄ²âÁ¿ÖµÎªR_x=22¡Á1=22¦¸
£¨2£©ÓÉͼ2ËùʾÂÝÐý²â΢Æ÷¿ÉÖª£¬¹Ì¶¨¿Ì¶ÈʾÊýΪ2mm£¬¿É¶¯¿Ì¶ÈʾÊýΪ£º15.0¡Á0.01mm=0.150mm£¬
ÂÝÐý²â΢Æ÷¶ÁÊýΪ2mm+0.150mm=2.150mm
£¨3£©ÒòµçÔ´µÄµçѹΪ4V£¬Òò´Ëµçѹ±íÑ¡Ôñ3VÁ¿³Ì£¬¼´CÏ
ÓÉÓÚR_x=22¦¸£¬¸ù¾ÝÅ·Ä·¶¨ÂÉ¿ÉÖª£¬µçÁ÷µÄ×î´óֵΪԼΪ£ºI=$\frac{4}{22}=0.118A$£¬´Ó¾«È·½ÇÀ´Ëµ£¬ËùÒÔµçÁ÷±íÑ¡Ôñ0.6AµÄÁ¿³Ì£¬¼´BÑ¡Ï
¸ù¾Ý´ý²âµç×èµÄ×èÖµÓëµçѹ±í¼°µçÁ÷±íµÄ×èÖµ£¬¿ÉÖª£¬$\frac{{R}_{V}}{{R}_{x}}£¼\frac{{R}_{x}}{{R}_{A}}$£¬Òò´ËÑ¡ÔñµçÁ÷±íÄÚ½Ó·¨£¬¹ÊÑ¡ÔñÒÒͼ£®
£¨4£©¸ù¾ÝÅ·Ä·¶¨ÂɵãºR_x=$\frac{U}{I}$£¬¸ù¾ÝR_x=$¦Ñ\frac{L}{S}$µÃ£º$¦Ñ=\frac{¦ÐU{d}^{2}}{4IL}$
¹Ê´ð°¸Îª£º£¨1£©22£»£¨2£©2.150£»£¨3£©CB£»ÒÒ£»£¨4£©$\frac{¦ÐU{d}^{2}}{4IL}$

µãÆÀ ±¾Ì⿼²éÈçºÎÑ¡ÔñÒÇÆ÷£¬ÕÆÎÕÑ¡ÔñµÄ·½·¨ÓëÔ­Ôò£»Í¬Ê±×¢Òâµç·ͼµÄÕýÈ·Ñ¡Ôñ£¬Ã÷È·¡°´óÄÚСÍ⡱µÄÑ¡Ôñ·½·¨£®