ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬µçÔ´µçѹ±£³Ö²»±ä¡£Ð¡µÆÅÝL±êÓС°2.5 V¡¡0.625 W¡±×ÖÑù£¬»¬¶¯±ä×èÆ÷R1µÄ×î´óֵΪ30 ¦¸£¬¶¨Öµµç×èR2£½30 ¦¸¡£ºöÂÔζȶԵÆË¿µç×èµÄÓ°Ïì¡£Çë½â´ðÏÂÁÐÎÊÌâ¡£
(1)СµÆÅݵÆË¿µÄµç×èÊǶàÉÙ£¿
(2)½«¿ª¹ØÈ«²¿±ÕºÏ£¬µ±±ä×èÆ÷µÄ»¬Æ¬PÒƵ½Öеãʱ£¬µçÁ÷±íʾÊýΪ0.45 A¡£Ôòµçѹ±íµÄʾÊýÊǶàÉÙ£¿
(3)Ö»±ÕºÏ¿ª¹ØS£¬Òƶ¯»¬Æ¬PʹСµÆÅÝÕý³£·¢¹â£¬Ôò´Ëʱ»¬¶¯±ä×èÆ÷ÏûºÄµÄµç¹¦ÂÊÊǶàÉÙ£¿
¡¾´ð°¸¡¿(1)10£»(2)4.5V£»£¨3£©0.5W
¡¾½âÎö¡¿
(1)СµÆÅÝLµÄÃúÅÆ¿ÉÖª£¬Ð¡µÆÅݵĶµçѹÊÇ2.5V£¬¶î¶¨¹¦ÂÊÊÇ0.625W£¬ÔòСµÆÅݵÆË¿µÄµç×è
===10
(2)¿ª¹ØS¡¢¡¢È«²¿±ÕºÏ£¬±ä×èÆ÷Ó붨ֵµç×è²¢Áª£¬µÆÅÝL±»¶Ì·£¬µçѹ±í²â±ä×èÆ÷Á½¶Ëµçѹ£¬¼´µçÔ´µçѹ£¬µçÁ÷±í²â¸É·µçÁ÷£¬±ä×èÆ÷µÄ»¬Æ¬PÒƵ½Öе㣬Ôò
=30=15
µçÁ÷±íʾÊýΪ0.45 A£¬¸ù¾Ý²¢Áªµç·ÖиÉ·µçÁ÷µÈÓÚ¸÷֧·µçÁ÷Ö®ºÍ¿ÉµÃ
+=0.45A
½âÖ®µÃµçÔ´µçѹ
U=4.5V
¼´µçѹ±íµÄʾÊýΪ4.5V¡£
(3)Ö»±ÕºÏ¿ª¹ØS£¬±ä×èÆ÷ÓëµÆÅÝL´®Áª£¬µçѹ±í²â±ä×èÆ÷Á½¶Ëµçѹ£¬µçÁ÷±í²âµç·ÖеĵçÁ÷£¬Òƶ¯»¬Æ¬PʹСµÆÅÝÕý³£·¢¹â£¬ÓÉÃúÅÆÖª£¬Ð¡µÆÅÝÕý³£·¢¹âʱµç·ÖеĵçÁ÷
===0.25A
¸ù¾Ý´®Áªµç·ÖеçÔ´µçѹµÈÓÚ¸÷ÓõçÆ÷Á½¶Ëµçѹ֮ºÍ£¬»¬¶¯±ä×èÆ÷Á½¶Ëµçѹ
=4.5V2.5V=2V
´Ëʱ»¬¶¯±ä×èÆ÷ÏûºÄµÄµç¹¦ÂÊ
==2V0.25A=0.5W
´ð£º(1)СµÆÅݵÆË¿µÄµç×èÊÇ10¡£
(2)µçÔ´µçѹÊÇ4.5V¡£
(3)Ö»±ÕºÏ¿ª¹ØS£¬Òƶ¯»¬Æ¬PʹСµÆÅÝÕý³£·¢¹â£¬Ôò´Ëʱ»¬¶¯±ä×èÆ÷ÏûºÄµÄµç¹¦ÂÊÊÇ0.5W¡£
¡¾ÌâÄ¿¡¿Èç±íÁгöһЩÎïÖʵıÈÈÈÈÝ£¬¸ù¾Ý±íÖÐÊý¾Ý£¬ÏÂÁÐÅжÏÕýÈ·µÄÊÇ£¨¡¡¡¡£©
ÎïÖÊ | Ë® | úÓÍ | ±ù | Ë®Òø | Í |
±ÈÈÈÈÝ/£¨J/kg¡æ£© | 4.2¡Á103 | 2.1¡Á103 | 2.1¡Á103 | 0.14¡Á103 | 0.39¡Á103 |
A.ÎïÖÊÖÖÀ಻ͬ£¬±ÈÈÈÈÝÒ»¶¨²»Í¬
B.ÎïÖʵÄÎï̬·¢Éú±ä»¯£¬±ÈÈÈÈݲ»±ä
C.ÖÊÁ¿ÏàµÈµÄ±ùºÍË®Éý¸ßÏàͬµÄζȣ¬Ë®ÎüÊÕµÄÈÈÁ¿¸ü¶à
D.ÒºÌåµÄ±ÈÈÈÈÝÒ»¶¨±È¹ÌÌåµÄ±ÈÈÈÈÝ´ó