ÌâÄ¿ÄÚÈÝ
2£®ÎªÁËÑо¿¹âÃôµç×èÔÚÊÒÄÚÕý³£¹âÕÕÉäºÍÊÒÍâÇ¿¹âÕÕÉäµç×èµÄ´óС¹Øϵ£¬Ä³Í¬Ñ§ÓÃÕýÈ·µÄ·½·¨½øÐÐʵÑ飬µÃ³öÁ½ÖÖU-IͼÏߣ¬ÈçͼËùʾ£®£¨1£©¸ù¾ÝU-IͼÏß¿ÉÖªÕý³£¹âÕÕʱ¹âÃôµç×èµÄ²âÁ¿ÖµÎª3000¦¸£¬Ç¿¹âÔ´ÕÕÉäʱ¹âÃôµç×èµÄ²âÁ¿ÖµÎª200¦¸£»
£¨2£©ÈôʵÑéÖÐËùÓõçѹ±íµÄÄÚ×èԼΪ5k¦¸£¬ºÁ°²±íµÄÄÚ×èԼΪ100¦¸£¬¿¼Âǵ½µç±íÄÚ×è¶ÔʵÑé½á¹ûµÄÓ°Ï죬Ϊʹ²âÁ¿Îó²î½ÏС£¬ÄãÈÏΪ£¬²âÁ¿Õý³£¹âÕÕÉäʱµÄ¹âÃôµç×èµÄ×èֵʱ£¬ºÁ°²±íµÄÁ¬½Ó·½Ê½²ÉÓÃÄÚ½Ó£¨Ñ¡Ìî¡°ÄÚ½Ó¡±»ò¡°Íâ½Ó¡±£©·¨½øÐÐʵÑ飬²âÁ¿Ç¿¹âÕÕÉäʱµÄ¹âÃôµç×èµÄ×èֵʱ£¬ºÁ°²±íµÄÁ¬½Ó·½Ê½²ÉÓÃÍâ½Ó£¨Ñ¡Ìî¡°ÄÚ½Ó¡±»ò¡°Íâ½Ó¡±£©·¨½øÐÐʵÑ飮
·ÖÎö £¨1£©¸ù¾ÝR=$\frac{U}{I}$¿ÉÖª£¬ÔÚU-IͼÏóÖÐбÂʵÈÓÚµç×è×èÖµ
£¨2£©¸ù¾Ý´ý²âµç×èÓëµçѹ±íºÍµçÁ÷±íÄÚ×è¼äµÄ¹Øϵ¼´¿ÉÃ÷È·Îó²îÇé¿ö£¬´Ó¶øÈ·¶¨Îó²î½ÏСµÄ½Ó·¨£®
½â´ð ½â£º£¨1£©¸ù¾ÝR=$\frac{U}{I}$ÇÒÔÚU-IͼÏóÖÐбÂʵÈÓÚµç×è×èÖµ¿ÉµÃ£¬
Õý³£¹âÕÕÉäʱRa=Ka=$\frac{¡÷U}{¡÷I}$=$\frac{2.4}{0.8¡Á10^{-3}}$¦¸=3000¦¸
Ç¿¹âÕÕÉäʱRb=Kb=$\frac{¡÷U}{¡÷I}$=$\frac{0.8}{4¡Á10^{-3}}$¦¸=200¦¸
£¨2£©²ÉÓÃÕý³£¹âÕÕÉäʱ£¬µç×èµÄ×èֵΪ3000¦¸£»¸ù¾Ý$\frac{R_{v}}{R}$=$\frac{5000}{3000}$=1.7£»
$\frac{R}{R_{A}}$=$\frac{3000}{100}$=30¿ÉµÃ£º$\frac{R_{v}}{R}$£¼$\frac{R}{R_{A}}$£¬Òò´Ë¸Ãµç×èΪ´óµç×裬Ӧ²ÉÓõçÁ÷±íÄÚ½Ó·¨£»
Ç¿¹âÕÕÉäʱ£¬¹âÃôµç×è×èֵΪ200¦¸£¬¸ù¾Ý$\frac{R_{v}}{R}$=$\frac{5000}{200}$=25£»
$\frac{R}{R_{A}}$=$\frac{200}{100}$=2¿ÉµÃ£º$\frac{R_{v}}{R}$£¾$\frac{R}{R_{A}}$£¬ËµÃ÷´Ëʱ¸Ãµç×èΪСµç×裬µçÁ÷±íµÄ·Öѹ×÷ÓÃÒýÆðµÄÎó²î´ó£¬Ó¦²ÉÓÃÍâ½Ó·¨£»
¹Ê´ð°¸Îª£º£¨1£©3000£»200£»£¨2£©ÄÚ½Ó Íâ½Ó
µãÆÀ ±¾Ì⿼²éµç·½Ó·¨ÒÔ¼°Îó²î·ÖÎöµÄ·½·¨£¬Òª×¢ÒâÃ÷È·µçÁ÷±íÄÚÍâ½Ó·¨µÄÕýÈ·Ñ¡Ôñ£¬°´ÕÕ´óµç×èÓ¦²ÉÓÃÄÚ½Ó·¨£¬Ð¡µç×è²ÉÓÃÍâ½Ó·¨µÄ·½Ê½½øÐÐÑ¡Ôñ£®
A£® | µç¶¯ÊƵķåֵΪ10 V | |
B£® | ½»Á÷·¢µç»úÏßȦ×ÔÖÐÐÔÃæת¹ý90¡ãµÄ¹ý³ÌÖеÄƽ¾ù¸ÐÓ¦µç¶¯ÊÆΪ$\frac{20\sqrt{2}}{¦Ð}$V | |
C£® | ½»Á÷·¢µç»úÏßȦͨ¹ýÖÐÐÔÃæʱµç¶¯ÊƵÄ˲ʱֵΪ10$\sqrt{2}$V | |
D£® | µç¶¯ÊƵÄÓÐЧֵΪ9 V |
A£® | 0-1sÄÚÎïÌåÑØÕý·½Ïò×öÔȼÓËÙÖ±ÏßÔ˶¯ | |
B£® | µÚ2sÄ©ÎïÌå´ïµ½µÄ×î´óËÙ¶È2m/s | |
C£® | µÚ4sÄ©ÎïÌåËÙ¶ÈΪ0 | |
D£® | µÚ4sÄ©ÎïÌå»Øµ½³ö·¢Î»Öà |
A£® | 2¿Ëij·ÅÉäÐÔÑùÆ·¾¹ýÒ»¸ö°ëË¥ÆÚºóÓÃÌìƽÔٴβâÁ¿¸ÃÑùÆ·£¬ÖÊÁ¿Îª1¿Ë | |
B£® | ¿µÆÕ¶ÙЧӦÉîÈëµØ½ÒʾÁ˹â¾ßÓв¨¶¯ÐÔ | |
C£® | ºËй©Ê¹ÊÎÛȾÎïCs137Äܹ»²úÉú¶ÔÈËÌåÓк¦µÄ·øÉ䣬ÆäºË·´Ó¦·½³ÌʽΪ$\underset{137}{55}$Cs¡ú$\underset{137}{56}$Ba+x£¬¿ÉÒÔÅжÏxΪµç×Ó | |
D£® | ÈôÓÃijһǿ¶ÈµÄÂ̹âÇ¡ÄÜʹij½ðÊô·¢Éú¹âµçЧӦ£¬ÔòÓøüµÍÇ¿¶ÈµÄ×ϹⲻÄÜʹ¸Ã½ðÊô·¢Éú¹âµçЧӦ |
A£® | ÎïÌåaËæµØÇò×ÔתµÄÏßËÙ¶ÈСÓÚÎÀÐÇbµÄÏßËÙ¶È | |
B£® | ÎÀÐÇbµÄ½ÇËÙ¶ÈСÓÚÎÀÐÇcµÄ½ÇËÙ¶È | |
C£® | ÎïÌåaËæµØÇò×ÔתµÄÖÜÆÚµÈÓÚÎÀÐÇcµÄÖÜÆÚ | |
D£® | ÎïÌåaËæµØÇò×ÔתµÄÏòÐļÓËÙ¶ÈСÓÚÎÀÐÇcµÄÏòÐļÓËÙ¶È |
A£® | ½ö½«R2Ôö´ó | B£® | ½ö½«R1Ôö´ó | C£® | ½ö½«R3Ôö´ó | D£® | ¶Ï¿ª¿ª¹ØS |