Question

7£®Á½Î»Í¬Ñ§ÔÚʵÑéÊÒÀûÓÃÈçͼ£¨a£©ËùʾµÄµç·²â¶¨¶¨Öµµç×èR₀¡¢µçÔ´µÄµç¶¯ÊÆEºÍÄÚµç×èr£®µ÷½Ú»¬¶¯±ä×èÆ÷µÄ»¬¶¯´¥Í·PÏòijһ·½ÏòÒƶ¯Ê±£¬Ò»¸öͬѧ¼Ç¼Á˵çÁ÷±íAºÍµçѹ±íV₁µÄ²âÁ¿Êý¾Ý£¬Áíһͬѧ¼Ç¼µÄÊǵçÁ÷±íAºÍµçѹ±íV₂µÄ²âÁ¿Êý¾Ý£®²¢¸ù¾ÝÊý¾ÝÃè»æÁËÈçͼ£¨b£©ËùʾµÄÁ½ÌõU-IÖ±Ïߣ®»Ø´ðÏÂÁÐÎÊÌ⣺
£¨1£©¸ù¾Ý¼×ÒÒÁ½Í¬Ñ§Ãè»æµÄÖ±Ïߣ¬¿ÉÖª¼×
A£®¼×ͬѧÊǸù¾Ýµçѹ±í V₁ºÍµçÁ÷±íAµÄÊý¾Ý
B£®¼×ͬѧÊǸù¾Ýµçѹ±í V₂ºÍµçÁ÷±íAµÄÊý¾Ý
C£®ÒÒͬѧÊǸù¾Ýµçѹ±í V₁ºÍµçÁ÷±íAµÄÊý¾Ý
D£®ÒÒͬѧÊǸù¾Ýµçѹ±í V₂ºÍµçÁ÷±íAµÄÊý¾Ý
£¨2£©¸ù¾Ýͼ£¨b£©£¬Çó³ö¶¨Öµµç×èR₀=2.0¦¸µçÔ´ÄÚµç×èr=1¦¸£®
£¨3£©Èô½«¶¨Öµµç×èR₀Ö±½Ó½ÓÔڴ˵çÔ´ÉÏ£¬ÔòR₀ÏûºÄµÄ¹¦ÂÊP=0.5W£®

Answer 1

·ÖÎö £¨1£©´Óµç·Á¬½Ó½áºÏµçÁ÷±íºÍµçѹ±íµÄ¶ÁÊý±ä»¯ÅжÏͼÏߵĺ¬Ò壮
£¨2£©ÓÉͼ¿ÉÖª£¬Í¼ÏóÓÉ×Ý×ø±êµÄ½»µãΪµç¶¯ÊÆ£»ÓÉͼÏóÓëºá×ø±êµÄ½»µãÀûÓñպϵç·ŷķ¶¨ÂÉ¿ÉÇóµÃÄÚµç×裮
£¨3£©¸ù¾Ý¹¦Âʹ«Ê½¿ÉÇóµÃR₀ÏûºÄµÄ¹¦ÂÊ£®

½â´ð ½â£º£¨1£©´Óµç·Á¬½Ó¿ÉÒÔ¿´³ö£¬µçÁ÷±íAµÄ¶ÁÊýÔö´óʱ£¬µçѹ±íV₁µÄ¶ÁÊý¼õС£¬µçѹ±íV₂µÄ¶ÁÊýÔö´ó£®
ÓÉͼÏó¿ÉÖª£¬µçѹ±íV₁ºÍµçÁ÷±íAµÄÊý¾Ý»æÖÆͼÏóÊǼף»
¸ù¾Ýµçѹ±íV₂ºÍµçÁ÷±íAµÄÊý¾Ý»æÖÆͼÏóÊÇÒÒ£®
£¨2£©´ÓͼÏó¿ÉÒԵóö¶¨Öµµç×èR₀µÄ×èֵΪ£ºR₀=$\frac{{U}_{2}}{I}$=$\frac{1V}{0.5A}$=2.0¦¸£»
¼×ͼÏó¿ÉÒԵóöͼÏóÔÚUÖáÉϵĽؾàΪ1.5V£¬¼´µçÔ´µÄµç¶¯ÊÆE=1.5V£¬
µçÔ´µÄÄÚ×裺r=$\frac{¡÷{U}_{1}}{¡÷I}$=$\frac{1.5-1}{0.5}$=1¦¸£¬¼´µçÔ´µÄÄÚ×èΪr=1¦¸£®
£¨3Èô½«R0½ÓÈë´ËµçÔ´£¬Ôò¹¦ÂÊP=I2R0=£¨$\frac{1.5}{2+1}$£©¡Á2=0.5W£»
¹Ê´ð°¸Îª£º£¨1£©A£»£¨2£©2.0¦¸£»1¦¸£»£¨3£©0.5W

µãÆÀ ±¾Ì⿼²é²âÁ¿µç¶¯ÊƺÍÄÚµç×èʵÑéµÄÊý¾ÝºÍ¶¨Öµµç×èµçÁ÷¼°µçѹÊý¾ÝµÄ´¦Àí£¬²¢ÄÜÓÃͼÏó·¨Çó³öµçÊƺÍÄÚµç×裮