ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬µçÔ´µçѹºã¶¨²»±ä£¬R2µÄ×èֵΪ8£¬Ð¡µÆÅÝLÉϱêÓС°6V 3W¡±×ÖÑù£¬Ð¡µÆÅݵç×è²»Ëæζȸı䣮Èô±ÕºÏS1¡¢S2 £¬ ¶Ï¿ªS3 £¬ СµÆÅݸպÃÕý³£·¢¹â£¬´Ëʱµçѹ±íµÄʾÊýΪ3V£¬ÄÇô£º
£¨1£©Ð¡µÆÅÝLµÄµç×èΪ¶à´ó£¿
£¨2£©µçÔ´µçѹΪ¶àÉÙ£¿
£¨3£©R1µç×èΪ¶à´ó£¿
£¨4£©Èô±ÕºÏS1¡¢S3 £¬ ¶Ï¿ªS2 £¬ ²¢Òƶ¯»¬¶¯±ä×èÆ÷RµÄ»¬Æ¬£¬»¬¶¯±ä×èÆ÷½ÓÈëµç·µÄµç×èΪ¶à´óʱ£¬µç·µÄ×ܹ¦ÂÊ×î´ó£¬Õâ¸ö×î´óµÄ¹¦ÂʵÈÓÚ¶àÉÙ£¿
¡¾´ð°¸¡¿
£¨1£©½â£ºÓÉP= ¿ÉÖª£¬
µÆÅݵç×èΪRL= =12¦¸£»
´ð£ºµÆÅݵç×èΪ12¦¸£»
£¨2£©½â£º±ÕºÏS1¡¢S2£¬¶Ï¿ªS3£¬µÆÅÝÓ붨ֵµç×èR1´®Áª£¬µÆÅÝÕý³£·¢¹â£¬
ËùÒÔµçÔ´µçѹU=UL+U¶î=6V+3V=9V£»
´ð£ºµçÔ´µçѹΪ9V£»
£¨3£©½â£ºµÆÅÝÕý³£·¢¹âʱ£¬µç·µçÁ÷ΪI= =0.5A£¬
ËùÒÔR1µÄ×èֵΪR1= =6¦¸£»
´ð£ºR1µÄ×èֵΪ6¦¸£»
£¨4£©½â£º±ÕºÏS1¡¢S3£¬¶Ï¿ªS2£¬»¬¶¯±ä×èÆ÷¡¢¶¨Öµµç×èR2ºÍµÆÅÝ´®Áª£¬ÒªÊ¹µç·×ܹ¦ÂÊ×î´ó£¬Ò²¾ÍÊǵç·×ܵç×è×îС£¬¼´»¬¶¯±ä×èÆ÷½ÓÈëµç·µç×èΪ0£¬
´ËʱµÄµç·µçÁ÷ΪI×î´ó= =0.45A£¬
´ËʱµÄµç¹¦ÂÊΪP×î´ó=UI×î´ó=9V¡Á0.45A=4.05W£®
´ð£º»¬¶¯±ä×èÆ÷½ÓÈëµç·µç×èΪ0ʱ£¬µç·µÄ×ܹ¦ÂÊ×î´ó£»´ËʱµÄµç¹¦ÂÊΪ4.05W£®
¡¾½âÎö¡¿¸ù¾ÝµÆÅݵĹæ¸ñ£¬¿ÉÒÔ¼ÆËãµÆÅݵĵç×èºÍµçÁ÷£¬Ôڱպϲ»Í¬µÄ¿ª¹Øʱ£¬Ðγɲ»Í¬µÄµç·£¬½áºÏÅ·Ä·¶¨Âɺ͵繦ÂʵļÆË㹫ʽ½øÐмÆËã.
¡¾¿¼µã¾«Îö¡¿±¾ÌâÖ÷Òª¿¼²éÁ˵緵Ļù±¾Á¬½Ó·½Ê½ºÍÅ·Ä·¶¨Âɼ°ÆäÓ¦ÓõÄÏà¹Ø֪ʶµã£¬ÐèÒªÕÆÎյ緵ÄÁ¬½Ó·½Ê½·Ö£º´®ÁªºÍ²¢ÁªÁ½ÖÖ£»Å·Ä·¶¨ÂɵÄÓ¦Ó㺠¢Ù ͬһ¸öµç×裬×èÖµ²»±ä£¬ÓëµçÁ÷ºÍµçѹÎÞ¹Ø µ«¼ÓÔÚÕâ¸öµç×èÁ½¶ËµÄµçѹÔö´óʱ£¬Í¨¹ýµÄµçÁ÷Ò²Ôö´ó£®£¨R=U/I£© ¢Ú µ±µçѹ²»±äʱ£¬µç×èÔ½´ó£¬Ôòͨ¹ýµÄµçÁ÷¾ÍԽС£®£¨I=U/R£© ¢Û µ±µçÁ÷Ò»¶¨Ê±£¬µç×èÔ½´ó£¬Ôòµç×èÁ½¶ËµÄµçѹ¾ÍÔ½´ó£®£¨U=IR£©²ÅÄÜÕýÈ·½â´ð´ËÌ⣮