ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬µçÔ´µçѹΪ12V£¬»¬¶¯±ä×èÆ÷µÄ×î´óֵΪ42¦¸£¬µçÁ÷±íµÄÁ¿³ÌΪ0¡«0.6A£¬µçѹ±íµÄÁ¿³ÌΪ0¡«9 V¡£µ±¿ª¹ØSºÍS1¶¼±ÕºÏ£¬»¬¶¯±ä×èÆ÷µÄ»¬Æ¬ÒÆÖÁAµãʱ£¬µÆÕý³£·¢¹â£¬»¬¶¯±ä×èÆ÷µÄ¹¦ÂÊΪ3W£»µ±S±ÕºÏ£¬S1¶Ï¿ª£¬»¬¶¯±ä×èÆ÷µÄ»¬Æ¬ÒÆÖÁBµãʱ£¬µÆµÄ¹¦ÂÊÊǶ¹¦ÂʵÄ1/4£¬¶¨Öµµç×èR1µÄ¹¦ÂÊÊǵÆË¿¹¦ÂʵÄ1/2£¬´Ëʱ»¬¶¯±ä×èÆ÷µÄ¹¦ÂÊÊÇ1.875W¡£Çó£º
(1)µçÁ÷±íÇ°ºóÁ½´ÎʾÊýÖ®±È£»
(2)µÆÅݵĶµçѹ£»
(3)R AºÍRBµÄÖµ£»
(4)Çóµç·Öй¦ÂʵÄ×î´óÖµºÍ×îСֵ¡£
¡¾´ð°¸¡¿(1)2¡Ã1£»(2)6 V£»(3)RA£½12¦¸£¬RB£½30¦¸£»(4)6W£¬2.4W¡£
¡¾½âÎö¡¿
£¨1£©¿ª¹ØSºÍS1¶¼±ÕºÏ£¬»¬¶¯±ä×èÆ÷µÄ»¬Æ¬PÒÆÖÁAµãʱ£¬LÓë±ä×èÆ÷´®Áª£¬µÆÅÝÕý³£·¢¹â£»
S±ÕºÏ£¬S1¶Ï¿ª£¬»¬¶¯±ä×èÆ÷µÄ»¬Æ¬PÒÆÖÁBµãʱ£¬L¡¢R1¡¢±ä×èÆ÷´®Áª£¬µÆÅÝÏûºÄµÄ¹¦ÂÊÊǶ¹¦Âʵģ®ÓÉP=I2R±íʾµÆÅݹ¦ÂÊ£¬´Ó¶øµÃµ½Á½´ÎµçÁ÷¹Øϵ£»
£¨2£©¸ù¾ÝÁ½´Î±ä×èÆ÷¹¦ÂÊ£¬ÓÉP=I2RµÃ³öÁ½´Î±ä×èÆ÷Á¬Èë×èÖµRA¡¢RBµÄ¹Øϵ£»
¸ù¾ÝµÚÁ½´Îµç·ÖÐR1µÄ¹¦Âʺ͵ÆÅÝʵ¼Ê¹¦ÂÊ£¬ÓÉP=I2RµÃ³öµÆÅÝÓëR1µç×è¹Øϵ£¬´Ó¶øµÃ³öµÆÅÝÓëRAµç×è¹Øϵ£»ÓÉ´®Áªµç··ÖѹÔÀíºÍµÚÒ»´Îµç·¼ÆËãµÆÅݶµçѹ£»
£¨3£©ÓɵÚÒ»´Îµç·»¬¶¯±ä×èÆ÷¹¦ÂÊ£¬¸ù¾Ý¼ÆËãRAµÄÖµ£¬´Ó¶øµÃµ½RBµÄÖµ£»
£¨4£©¸ù¾ÝP=UI£¬µçÔ´µçѹһ¶¨£¬µ±µç·µçÁ÷×î´óʱ£¬¹¦ÂÊ×î´ó£»µç·µçÁ÷×îСʱ£¬¹¦ÂÊ×îС£¬ÓɼÆËãµç·µÄ×î´óºÍ×îС¹¦ÂÊ¡£
£¨1£©ÓÉͼ£¬µ±¿ª¹ØSºÍS1¶¼±ÕºÏ£¬»¬¶¯±ä×èÆ÷µÄ»¬Æ¬PÒÆÖÁAµãʱ£¬LÓë±ä×èÆ÷´®Áª£¬Èô´Ëʱµç·ÖеçÁ÷I1£¬µÆÅÝÕý³£·¢¹â£¬Ôò£ºP¶îL=I12RL£¬
S±ÕºÏ£¬S1¶Ï¿ª£¬»¬¶¯±ä×èÆ÷µÄ»¬Æ¬PÒÆÖÁBµãʱ£¬L¡¢R1¡¢±ä×èÆ÷´®Áª£¬µÆÅÝÏûºÄµÄ¹¦ÂÊÊǶ¹¦Âʵģ¬´Ëʱµç·ÖеçÁ÷ΪI2£¬Ôò£ºPʵL=I22RL£¬
£¬¼´£º£¬
ËùÒÔ£º£¬ÔòÓУº£»
£¨2£©ÓÉP=I2R¿ÉÖª£¬µÚÒ»´Îµç·ÖУ¬»¬¶¯±ä×èÆ÷¹¦ÂÊ£ºPA=I12RA=3W£¬µÚ¶þ´Îµç·ÖУ¬»¬¶¯±ä×èÆ÷¹¦ÂÊ£ºPB=I22RB=1.875W£¬
ËùÒÔ£º£¬¼´£¬
ÔòÓУº£»
µÚ¶þ´Îµç·ÖÐR1µÄ¹¦ÂÊÊǵÆË¿¹¦Âʵģ¬¼´PʵL=2P1£¬
ÓÉP=I2RÓУºI22RL=2I22R1£¬ËùÒÔ£º£¬
ÓÉ´®Áªµç·ÌصãºÍÅ·Ä·¶¨ÂÉÁ½´Îµç·ÖеçÁ÷£º
£¬£¬
ËùÒÔ£º£¬
¼´£º£¬½âµÃ£ºRL=RA£¬
µÚÒ»´Îµç·ÖУ¬PÒÆÖÁAµãʱ£¬LÓë±ä×èÆ÷´®Áª£¬µÆÅÝÕý³£·¢¹â£¬ÓÉ´®Áªµç·µÄ·ÖѹÔÀíÖª£º
£¬
ÓÖÒòΪ£ºU=U¶îL+UA=12V£¬
ËùÒÔµÆÅݵĶµçѹ£ºUA=U¶îL=6V£»
£¨3£©ÔÚµÚÒ»´Îµç·ÖУ¬±ä×èÆ÷¹¦ÂÊΪ3W£¬Óɿɵãº
£¬
ËùÒÔ£»
£¨4£©¸ù¾ÝP=UI£¬µçÔ´µçѹһ¶¨£¬µ±µç·µç×è×îСʱ£¬¹¦ÂÊ×î´ó¡£
ÓɵÚÒ»´Îµç·£¬µÆÅÝÕý³£¹¤×÷ʱ£¬µç·ÖеçÁ÷×î´ó£¬µç·Öй¦ÂÊ×î´ó£¬ËùÒÔ£º
£»
µÚ¶þ´Îµç·ÖУ¬µ±»¬Æ¬PÔÚÓÒ¶Ëʱ£¬µç·Öеç×è×î´ó£¬µçÁ÷×îС£¬¹¦ÂÊ×îС£¬ËùÒÔ£º
¡£
¡¾ÌâÄ¿¡¿ÔÚ̽¾¿¡°µçѹһ¶¨Ê±£¬µçÁ÷¸úµç×èµÄ¹Øϵ¡±µÄʵÑéÖУ¬Éè¼Æµç·ͼÈçͼ¼×Ëùʾ¡£
£¨1£©Çë¸ù¾Ýͼ¼×µç·ͼÓñʻÏß´úÌæµ¼Ïß½«Í¼ÒÒËùʾʵÎïÁ¬½Ó³ÉÍêÕûµç·£¨µ¼Ïß²»ÔÊÐí½»²æ£©¡£
£¨______£©
£¨2£©µ±°ÑR£½5¦¸»»³É10¦¸µÄ¶¨Öµµç×裬±ÕºÏ¿ª¹Ø£¬Ôòµçѹ±íµÄʾÊý»á_____£¨Ìî¡°±ä´ó¡±¡¢¡°±äС¡±»ò¡°²»±ä¡±£©£¬½ÓÏÂÀ´Ó¦¸Ã°Ñ»¬Æ¬Ïò_____£¨Ìî¡°×ó¡±»ò¡°ÓÒ¡±£©»¬¶¯²ÅÂú×ãʵÑéµÄÌõ¼þ¡£
£¨3£©Á¬½ÓºÃµç·½øÐÐʵÑ飬¶à´Î¸Ä±äRµÄ×èÖµ£¬µ÷½Ú»¬¶¯±ä×èÆ÷£¬Ê¹µçѹʾÊý±£³Ö²»±ä£¬ÊµÑéÊý¾Ý¼Ç¼Èç±í£¬ÆäÖеÚ5´ÎʵÑéµçÁ÷±íʾÊýÈçͼ±ûËùʾ£¬Æä¶ÁÊýΪ_____A¡£
ʵÑé´ÎÊý | 1 | 2 | 3 | 4 | 5 |
µç×èR/¦¸ | 5 | 10 | 15 | 20 | 25 |
µçÁ÷V/A | 0.6 | 0.3 | 0.2 | 0.15 |
£¨4£©ÊµÑé½áÂÛÊÇ_____¡£
£¨5£©½«Í¼¼×Öеĵç×èR»»³ÉÒ»¸ö¶î¶¨µçѹΪ3.8V¡¢×èֵԼΪ10¦¸µÄСµÆÅݺ󣬻¹¿ÉÒÔ²âСµÆÅݵĵ繦ÂÊ£¬ÈôÒª²â¸ÃСµÆÅݵĶ¹¦ÂÊ£¬Ôò±ØÐëÔÚÁ¬½Ó³ÉÍêÕûµÄͼÒҵ緻ù´¡ÉÏ£¬½øÐеĸĽÓÊÇ_____¡£