ÌâÄ¿ÄÚÈÝ
![¾«Ó¢¼Ò½ÌÍø](http://thumb.1010pic.com/pic3/upload/images/201402/2/6ef8bf78.png)
£¨1£©¸ÃʵÑéµÄÔÀíÊÇ
£¨2£©¸Ã×éͬѧÁ¬½ÓºÃµç·µÄ×îºóÒ»¸ùµ¼Ïßʱ£¬Ð¡µÆÅÝÁ¢¿Ì·¢³ö΢ÈõµÄ¹âÁÁ£®µ¼ÖÂÉÏÊöÏÖÏóµÄ²»¹æ·¶²Ù×÷ÊÇ£º
£¨3£©ÊµÑé²Ù×÷ÖÐÓпÉÄܳöÏÖÏÂÁÐA¡¢B¡¢C¡¢DËÄÖÖ´íÎó£¬Èç¹û³öÏÖ£ºµçÁ÷±íʾÊý½Ï´ó£¬µçѹ±íʾÊýΪ0µÄÏÖÏó£®Æä´íÎóÊôÓÚ
A£®µçÁ÷±íµÄÕý¸º½ÓÏßÖù½Ó·´ B£®µçѹ±íµÄÁ¿³ÌѡСÁË
C£®µÆ·¢ÉúÁ˶Ì· D£®°Ñ»¬¶¯±ä×èÆ÷϶ËÁ½½ÓÏßÖùÁ¬Èëµç·
£¨4£©Èôij´Î²âÁ¿Ê±µçѹ±íµÄʾÊýΪ2V£¬µçÁ÷±íµÄʾÊýÈçͼËùʾ£¬ÔòµçÁ÷±íµÄʾÊýΪ
£¨5£©¸Ã×éͬѧ·Ö±ð¼Ç¼Èý×éµçѹºÍµçÁ÷Öµ£¬Í¨¹ý¼ÆËã·¢ÏÖµÆË¿µç×èÊDz»Í¬µÄ£¬ËûÃÇ»¹Á˽⵽ÆäËû×éͬѧҲµÃµ½ÀàËƵĽá¹û£®³öÏÖÕâÖÖ½á¹ûµÄÔÒòÊÇ£º
·ÖÎö£º£¨1£©·ü°²·¨²âµÆÅݵç×èµÄÔÀí£ºR=
£®
£¨2£©Á¬½Óµç·ʱ£¬¿ª¹Øδ¶Ï¿ª£¬Á¬½ÓÍê×îºóÒ»¸ùµ¼Ïߣ¬µç·»áÁ¬Í¨£¬ÉÕ»µÔª¼þ£®
£¨3£©µÆÅݶÌ·ʱ£¬µç·×ܵç×è½ÏС£¬µç·µçÁ÷½Ï´ó£¬Óë´ý²âµç×è²¢ÁªµÄµçѹ±íʾÊýΪÁ㣬¾Ý´Ë·ÖÎöµç·¹ÊÕÏÔÒò£®
£¨4£©µçÁ÷±í¶ÁÊý£ºÈ·¶¨Ê¹ÓõÄÁ¿³Ì£¬È·¶¨Ã¿Ò»¸ö´ó¸ñºÍÿһ¸öС¸ñ¸÷´ú±í¶àÉÙ£®ÖªµÀµçѹºÍµçÁ÷£¬¸ù¾ÝR=
¼ÆËãµç×裮
Òª²âÁ¿µÆÅݵĶµçѹ£¬Ôö´óµÆÅݵĵçѹ£¬Ôö´óµÆÅݵçÁ÷£¬¼õСµç·×ܵç×裬¼õС»¬¶¯±ä×èÆ÷Á¬Èëµç·µÄµç×裮
£¨5£©´Óµ¼Ìåµç×è´óСµÄÓ°ÏìÒòËØ·ÖÎö£®
U |
I |
£¨2£©Á¬½Óµç·ʱ£¬¿ª¹Øδ¶Ï¿ª£¬Á¬½ÓÍê×îºóÒ»¸ùµ¼Ïߣ¬µç·»áÁ¬Í¨£¬ÉÕ»µÔª¼þ£®
£¨3£©µÆÅݶÌ·ʱ£¬µç·×ܵç×è½ÏС£¬µç·µçÁ÷½Ï´ó£¬Óë´ý²âµç×è²¢ÁªµÄµçѹ±íʾÊýΪÁ㣬¾Ý´Ë·ÖÎöµç·¹ÊÕÏÔÒò£®
£¨4£©µçÁ÷±í¶ÁÊý£ºÈ·¶¨Ê¹ÓõÄÁ¿³Ì£¬È·¶¨Ã¿Ò»¸ö´ó¸ñºÍÿһ¸öС¸ñ¸÷´ú±í¶àÉÙ£®ÖªµÀµçѹºÍµçÁ÷£¬¸ù¾ÝR=
U |
I |
Òª²âÁ¿µÆÅݵĶµçѹ£¬Ôö´óµÆÅݵĵçѹ£¬Ôö´óµÆÅݵçÁ÷£¬¼õСµç·×ܵç×裬¼õС»¬¶¯±ä×èÆ÷Á¬Èëµç·µÄµç×裮
£¨5£©´Óµ¼Ìåµç×è´óСµÄÓ°ÏìÒòËØ·ÖÎö£®
½â´ð£º½â£º£¨1£©ÊµÑéÔÀíÊÇ£ºR=
£®
£¨2£©Á¬½ÓÍê×îºóÒ»¸ùµ¼Ïߣ¬µÆÅÝÁ¢·¢³ö΢ÈõµÄ¹âÁÁ£¬ËµÃ÷Á¬½Óµç·ʱ£¬¿ª¹Ø´¦ÓÚ±ÕºÏ״̬£®
£¨3£©µÆÅÝ·¢ÉúÁ˶Ì·£¬µç·µç×è½ÏС£¬µç·µçÁ÷½Ï´ó£¬µçѹ±íʾÊýΪÁ㣬¹ÊCÕýÈ·£®
£¨4£©µçÁ÷±íʹÓõÄ0¡«0.6AÁ¿³Ì£¬Ã¿Ò»¸ö´ó¸ñ´ú±í0.2A£¬Ã¿Ò»¸öС¸ñ´ú±í0.02A£¬µçÁ÷Ϊ0.2A£®
R=
=
=10¦¸£®
Òª²âµÆÅݵĶ¹¦ÂÊ£¬Ê¹µÆÅݵçѹ´Ó2VÔö´óµ½2.5V£¬Ôö´óµç·µçÁ÷£¬¼õС×ܵç×裬¼õС»¬¶¯±ä×èÆ÷Á¬Èëµç·µÄµç×裬»¬¶¯±ä×èÆ÷½Ó×ó°ë¶Î£¬ËùÒÔ»¬Æ¬×óÒÆ£®
£¨5£©ÊµÑé¹ý³ÌÖУ¬µÆË¿µÄ³¤¶È¡¢ºá½ØÃæ»ý¡¢²ÄÁÏ£¬µçѹ²»Í¬£¬µçÁ÷²»Í¬£¬µÆ˿ζȲ»Í¬£¬µç×費ͬ£¬ËùÒÔµÆË¿µÄµç×èÓëζÈÓйأ®
¹Ê´ð°¸Îª£º£¨1£©R=
£»£¨2£©Á¬½Óµç·ʱ¿ª¹Ø±ÕºÏ£»£¨3£©C£»£¨4£©0.2£»10£»×󣻣¨5£©µÆË¿µÄµç×èÓëζÈÓйأ®
U |
I |
£¨2£©Á¬½ÓÍê×îºóÒ»¸ùµ¼Ïߣ¬µÆÅÝÁ¢·¢³ö΢ÈõµÄ¹âÁÁ£¬ËµÃ÷Á¬½Óµç·ʱ£¬¿ª¹Ø´¦ÓÚ±ÕºÏ״̬£®
£¨3£©µÆÅÝ·¢ÉúÁ˶Ì·£¬µç·µç×è½ÏС£¬µç·µçÁ÷½Ï´ó£¬µçѹ±íʾÊýΪÁ㣬¹ÊCÕýÈ·£®
£¨4£©µçÁ÷±íʹÓõÄ0¡«0.6AÁ¿³Ì£¬Ã¿Ò»¸ö´ó¸ñ´ú±í0.2A£¬Ã¿Ò»¸öС¸ñ´ú±í0.02A£¬µçÁ÷Ϊ0.2A£®
R=
U |
I |
2V |
0.2A |
Òª²âµÆÅݵĶ¹¦ÂÊ£¬Ê¹µÆÅݵçѹ´Ó2VÔö´óµ½2.5V£¬Ôö´óµç·µçÁ÷£¬¼õС×ܵç×裬¼õС»¬¶¯±ä×èÆ÷Á¬Èëµç·µÄµç×裬»¬¶¯±ä×èÆ÷½Ó×ó°ë¶Î£¬ËùÒÔ»¬Æ¬×óÒÆ£®
£¨5£©ÊµÑé¹ý³ÌÖУ¬µÆË¿µÄ³¤¶È¡¢ºá½ØÃæ»ý¡¢²ÄÁÏ£¬µçѹ²»Í¬£¬µçÁ÷²»Í¬£¬µÆ˿ζȲ»Í¬£¬µç×費ͬ£¬ËùÒÔµÆË¿µÄµç×èÓëζÈÓйأ®
¹Ê´ð°¸Îª£º£¨1£©R=
U |
I |
µãÆÀ£º±¾Ì⿼²éÁË·ü°²·¨²âµç×èµÄʵÑéÔÀí¡¢Á¬½Óµç·ʱµÄ×¢ÒâÊÂÏî¡¢µçÁ÷±í¶ÁÊý¡¢µç×è¼ÆËã¡¢»¬¶¯±ä×èÆ÷»¬Æ¬ÔÚµç·ÖÐÏòÄıßÒƶ¯´ïµ½ÊµÑéÄ¿µÄ¡¢µÆË¿µç×èÓëζȵĹØϵµÈ£¬ÕâЩ֪ʶµã¶¼ÊÇ·ü°²·¨²âµç×èʵÑéÖо³£³öÏÖµÄÄÚÈÝ£¬Ò»¶¨ÒªÕÆÎÕ£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿