ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÁÁÁÁÉè¼ÆÁËÒ»¸öÓõçѹ±íµÄʾÊý±ä»¯·´Ó³»·¾³Î¶ȱ仯µÄµç·¡£Æäµç·ÔÀíͼÈçͼ£¨a£©Ëùʾ¡£ÆäÖУ¬µçÔ´Á½¶ËµçѹU=4V£¨ºã¶¨²»±ä£©¡£µçѹ±íµÄÁ¿³ÌΪ0¡«3V£¬R0ÊǶ¨Öµµç×裬R0=300¦¸£¬R1ÊÇÈÈÃôµç×裬Æäµç×èËæ»·¾³Î¶ȱ仯µÄ¹ØϵÈçͼ£¨b£©Ëùʾ¡£±ÕºÏ¿ª¹ØSºó¡£Çó£º
¢Ùµ±»·¾³Î¶ÈΪ40¡æʱ£¬ÈÈÃôµç×èR1µÄ×èÖµÊǶàÉÙ£¿
¢Úµ±»·¾³Î¶ÈΪ40¡æʱ£¬µçѹ±íµÄʾÊýÊǶàÉÙ£¿
¢Ûµçѹ±íÁ½¶Ëµçѹ²»Äܳ¬¹ýÆä×î´ó²âÁ¿Öµ£¬Ôò´Ëµç·ËùÔÊÐíµÄ×î¸ß»·¾³Î¶ÈÊǶàÉÙ£¿
¡¾´ð°¸¡¿£¨1£©200¦¸£»£¨2£©2.4V£»£¨3£©80¡æ¡£
¡¾½âÎö¡¿ÊÔÌâ·ÖÎö£º£¨1£©¸ù¾Ýͼb¿É¶Á³ö»·¾³Î¶ÈΪ40¡æʱ¶ÔÓ¦µÄR1µÄ×èֵΪ200¦¸£»£¨2£©»·¾³Î¶ÈΪ40¡æʱ£¬¸ù¾Ýµç×èµÄ´®ÁªÌصã¿ÉÖª£ºR×Ü=R0+R1=300¦¸+200¦¸=500¦¸£¬Ôò, I=U/R×Ü=4V/500¦¸=0£®008A£¬ÓÉÅ·Ä·¶¨ÂɵãºR0Á½¶ËµÄµçѹU0=IR0=0£®008A¡Á300¦¸=2£®4V£»£¨3£©ÓÉÌâÒâ¿ÉÖªµçѹ±íʾÊýÔÊÐí×î´óֵΪ3V£¬ÇÒ´Ëʱµç·Äܹ»²âÁ¿µÄζÈ×î¸ß£»¹Ê´Ëʱµç·ÖеĵçÁ÷Ϊ£º£¬´®Áªµç·Á½¶ËµÄµçѹµÈÓÚ¸÷²¿·Öµç·Á½¶ËµÄµçѹ֮ºÍ£¬¹ÊU1¡ä=U-U0¡ä=4V-3V=1V£¬ÓÉÅ·Ä·¶¨Âɵ㺴ËʱÈÈÃôµç×èµÄ×èÖµ
£¬¸ù¾Ýͼb¿É²éµÃÈÈÃôµç×èµÄ×èֵΪ100¦¸Ê±¶ÔӦζÈΪ80¡æ£¬¼´×î¸ßζÈΪ80¡æ¡£
![](http://thumb2018.1010pic.com/images/loading.gif)