ÌâÄ¿ÄÚÈÝ
14£®ÔÚ¡°²â¶¨½ðÊôµÄµç×èÂÊ¡±µÄʵÑéÖУ¬ÓÃÂÝÐý²â΢Æ÷²âÁ¿½ðÊôË¿Ö±¾¶Ê±µÄ¿Ì¶ÈλÖÃÈçͼ1Ëùʾ£¬ÓÃÃ׳߲âÁ¿½ðÊôË¿µÄ³¤¶Èl=0.810m£®½ðÊôË¿µÄµç×è´óԼΪ5¦¸£®ÏÈÓ÷ü°²·¨²â³ö½ðÊôË¿µÄµç×裬Ȼºó¸ù¾Ýµç×趨ÂɼÆËã³ö¸Ã½ðÊô²ÄÁϵĵç×èÂÊ£®£¨1£©´Óͼ1ÖжÁ³ö½ðÊôË¿µÄÖ±¾¶Îª0.600mm£®
£¨2£©ÔÚÓ÷ü°²·¨²â¶¨½ðÊôË¿µÄµç×èʱ£¬³ý±»²âµÄµç×èË¿Í⣬»¹ÓÐÈçϹ©Ñ¡ÔñµÄʵÑéÆ÷²Ä£º
Ö±Á÷µçÔ´£ºµç¶¯ÊÆÔ¼4.0V£¬ÄÚ×èºÜС£»
µçÁ÷±íA1£ºÁ¿³Ì0¡«0.6A£¬ÄÚ×èÔ¼0.125¦¸£» µçÁ÷±íA2£ºÁ¿³Ì0¡«3.0A£¬ÄÚ×èÔ¼0.025¦¸£»
µçѹ±íV1£ºÁ¿³Ì0¡«3V£¬ÄÚ×èÔ¼3k¦¸£» µçѹ±íV2£ºÁ¿³Ì0¡«15V£¬ÄÚ×èÔ¼15k¦¸£»
»¬¶¯±ä×èÆ÷R£º×î´ó×èÖµ30¦¸£» ¿ª¹Ø¡¢µ¼Ïߵȣ®
Ôڿɹ©Ñ¡ÔñµÄÆ÷²ÄÖУ¬µçÁ÷±íӦѡÓÃA1£¬µçѹ±íӦѡÓÃV1£®
£¨3£©¸ù¾ÝËùÑ¡µÄÆ÷²Ä£¬ÔÚͼ2µÄÐéÏß¿òÄÚ»³öʵÑéµç·ͼ£®
£¨4£©Èô¸ù¾ÝʵÑéÊý¾Ý×÷³ö½ðÊôË¿µÄU-IͼÏßÈçͼ3Ëùʾ£¬Ôò¸Ã½ðÊôË¿µÄµç×èΪ4.5¦¸£¬ÕâÖÖ½ðÊô²ÄÁϵĵç×èÂÊΪ1.2¡Á10-6¦¸•m£®£¨±£Áô¶þλÓÐЧÊý×Ö£©
·ÖÎö £¨1£©ÂÝÐý²â΢Æ÷¶ÁÊý=¹Ì¶¨¿Ì¶È¶ÁÊý+°ë¿Ì¶È¶ÁÊý+¿É¶¯¿Ì¶È¶ÁÊý£»
£¨2£©¸ù¾Ýµç·×î´óµçÁ÷Ñ¡ÔñµçÁ÷±í£¬¸ù¾ÝµçÔ´µç¶¯ÊÆ¡¢´ý²âµç×è×èÖµÓëËùÑ¡µçÁ÷±íÑ¡Ôñ»¬¶¯±ä×èÆ÷£®
£¨3£©¸ù¾ÝʵÑéÆ÷²ÄÈ·¶¨»¬¶¯±ä×èÆ÷½Ó·¨£¬¸ù¾Ý´ý²âµç×è×èÖµÓëµç±íÄÚ×è¹Øϵȷ¶¨µçÁ÷±í½Ó·¨£¬×÷³öµç·ͼ£®
£¨4£©ÓÉͼÇó³öµç×èÖµ£¬¸ù¾Ýµç×趨ÂÉÇó³ö½ðÊôË¿µÄµç×èÂÊ£®
½â´ð ½â£º£¨1£©ÓÉͼʾÂÝÐý²â΢Æ÷¿ÉÖª£¬¹Ì¶¨¿Ì¶È¶ÁÊý£º0.5mm£»¿É¶¯¿Ì¶È¶ÁÊý0.01mm¡Á10.0=0.100mm£»¹ÊÂÝÐý²â΢Æ÷¶ÁÊýΪ£º0.600mm£»
£¨2£©µç·µçÁ÷×î´óΪ$\frac{4.0}{5}=0.8A$£¬ÎªÌá¸ß¾«È·¶È£¬¼õС¶ÁÊýÎó²î£¬Ñ¡Ð¡Á¿³Ìµç±í£¬ÒÔ»¬¶¯±ä×èÆ÷À´¿ØÖƲ»³¬Á¿³Ì¼´¿É£¬¹ÊÑ¡µçÁ÷±íA1£ºÁ¿³Ì0¡«0.6A£¬ÄÚ×è0.125¦¸£»µçѹ±íӦѡV1£»
£¨3£©Îª±£Ö¤µç·°²È«£¬»¬¶¯±ä×èÆ÷²ÉÓÃÏÞÁ÷½Ó·¨£¬ÓÉÌâÒâÖª£¬µçÁ÷±í²ÉÓÃÍâ½Ó·¨£¬ÊµÑéµç·ͼÈçͼËùʾ£º
£¨4£©ÓÉͼ¿ÉµÃµç×èֵΪ£º$R=\frac{0.45}{0.1}=4.5¦¸$£®
Óɵç×趨ÂɵãºR=¦Ñ$\frac{L}{S}=¦Ñ\frac{L}{¦Ð£¨\frac{d}{2}£©^{2}}$£¬
µç×èÂʦÑ=$\frac{¦Ð{d}^{2}R}{4L}=\frac{3.14¡Á{£¨0.600¡Á1{0}^{-3}£©}^{2}¡Á4.5}{4¡Á0.810}$¡Ö1.2¡Á10-6¦¸•m£®
¹Ê´ð°¸Îª£º£¨1£©0.600£»£¨2£©A1£»V1£»£¨3£©µç·ͼÈçͼËùʾ£»£¨4£©1.2¡Á10-6£®
µãÆÀ ±¾Ìâ¹Ø¼ü£º£¨1£©Ó÷ü°²·¨²âµç×èʱ°²Åà±íÄÚ¡¢Íâ½Ó·¨µÄÑ¡ÔñÔÔòÊÇ¡°´óÄÚСÍ⡱£¬¼´¶ÔÓÚ´óµç×è²ÉÓð²Åà±íÄÚ½Ó·¨£¬¶ÔÓÚСµç×è²ÉÓð²Åà±íÍâ½Ó·¨£»£¨2£©ÐèÒªÓнϴóµÄµçѹ²âÁ¿·¶Î§Ê±£¬»¬¶¯±ä×èÆ÷²ÉÓ÷Öѹʽ½Ó·¨£®
A£® | µçÁ÷´óС±ä»¯£¬·½Ïò²»±ä£¬ÊÇÖ±Á÷µç | |
B£® | µçÁ÷´óС¡¢·½Ïò¶¼±ä»¯£¬Êǽ»±äµçÁ÷ | |
C£® | µçÁ÷×î´óֵΪ0.2A£¬ÖÜÆÚΪ0.01s | |
D£® | µçÁ÷´óС±ä»¯£¬·½Ïò²»±ä£¬²»ÊÇÖ±Á÷µç£¬Ò²²»Êǽ»±äµçÁ÷ |
A£® | µçÔ´µÄ×ܹ¦ÂÊΪ1.5W | B£® | µçÔ´µÄÊä³ö¹¦ÂÊΪ1.25W | ||
C£® | µÆLʵ¼ÊÏûºÄµÄ¹¦ÂÊΪ1W | D£® | µçÔ´ÄÚ×èÏûºÄµÄ¹¦ÂÊΪ0.25W |