ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Èçͼ¼×Ϊһ¸ö³¬Éù²¨¼ÓʪÆ÷£¬ÈçͼÒÒΪÆäÄÚ²¿Êª¶È¼à²â×°Öõļò»¯µç·ͼ¡£ÒÑÖªµçÔ´µçѹΪ12V£¬¶¨Öµµç×èR1µÄ×èֵΪ30¦¸£¬Êª¶È¼ÆÊÇÓÉÁ¿³ÌΪ0¡«9Vµçѹ±í¸Ä×°¶ø³É¡£ÊªÃôµç×èR2µÄ×èÖµËæʪ¶ÈRH±ä»¯µÄ¹ØϵͼÏñÈçͼ±ûËùʾ£¬Æä×èÖµ×î´óΪ120¦¸£¨Í¼ÖÐδ»³ö£©¡£ÔòÔڵ緰²È«¹¤×÷µÄÇ°ÌáÏ£¬ÏÂÁÐÅжÏÕýÈ·µÄÊÇ
A.ʪ¶ÈÔö´óʱ£¬R2µÄµçÁ÷ºÍµçѹ¶¼±ä´ó
B.ʪ¶ÈÔö´óʱ£¬µç·ÖеÄ×ܹ¦ÂÊ×î´ó
C.µç·ÏûºÄµÄ×ܹ¦ÂÊ×î´óΪ3.6W
D.ʪ¶ÈΪ0ʱ£¬µç·ÖеĵçÁ÷Ϊ0.4A
¡¾´ð°¸¡¿C
¡¾½âÎö¡¿
A£®Óɵç·ͼ¿ÉÖª£¬R1ÓëR2´®Áª£¬µçѹ±í²âR2Á½¶Ëµçѹ¡£ÓÉͼ±û¿ÉÖª£¬Êª¶ÈÔö´óʱ£¬R2µÄ×èÖµ±ä´ó£¬´Ëʱµç·µÄ×ܵç×è±ä´ó£¬ÓÉI=¿ÉÖª£¬µç×è±ä´óµç·µçÁ÷±äС£¬Í¨¹ýR2µÄµçÁ÷±äС£¬ÓÉU=IR¿ÉÖª£¬R1Á½¶ËµÄµçѹ±äС£¬Òò´®Áªµç·ÖÐ×ܵçѹµÈÓÚ¸÷·Öµçѹ֮ºÍ£¬ËùÒÔ£¬R2Á½¶ËµÄµçѹ±äС¡£¹ÊA´íÎó£»
B£®Êª¶ÈÔö´óʱ£¬R2µÄ×èÖµ±ä´ó£¬µç·µçÁ÷±äС£¬×ܵçѹ²»±ä£¬ÓÉP=UI£¬µç·ÖеÄ×ܹ¦ÂʱäС£¬¹ÊB´íÎó£»
C£®ÓÉͼ±û¿ÉÖª£¬Êª¶ÈΪ0ʱR2= 10¦¸£¬ÊªÃôµç×èµÄ×èÖµ×îС£¬µç·ÖеĵçÁ÷×î´ó£¬µç·ÏûºÄµÄ×ܹ¦ÂÊ×î´ó£¬Òò´®Áªµç·ÖÐ×ܵç×èµÈÓÚ¸÷·Öµç×èÖ®ºÍ£¬ËùÒÔ£¬µç·ÖеĵçÁ÷£º
µç·ÏûºÄµÄ×ܹ¦ÂÊ×î´óΪ£º
P´ó=UI´ó=12V¡Á0.3A=3.6W
¹ÊCÕýÈ·£»
D£®ÓÉͼ±û¿ÉÖª£¬Êª¶ÈΪ0ʱR2= 10¦¸£¬ÊªÃôµç×èµÄ×èÖµ×îС£¬µç·ÖеĵçÁ÷×î´ó£¬µç·ÏûºÄµÄ×ܹ¦ÂÊ×î´ó£¬Òò´®Áªµç·ÖÐ×ܵç×èµÈÓÚ¸÷·Öµç×èÖ®ºÍ£¬ËùÒÔ£¬µç·ÖеĵçÁ÷£º
¹ÊDÕýÈ·¡£
¡¾ÌâÄ¿¡¿Ä³ÖÐѧ³õÈýÄ꼶¿ÎÍâÐËȤС×éµÄͬѧ£¬°´Èçͼ¼×ËùʾµÄʵÎïÁ¬½Óͼ×ö¡°²â¶¨Ð¡µÆÅݵĵç×衱ʵÑ飨СµÆÅݱêÓС°2.5·ü¡±×ÖÑù£©£¬µçÔ´µçѹΪ4V£¬ÔÚʵÑé¹ý³ÌÖеõ½ÁËÈçϱíËùʾµÄÒ»×éUºÍIµÄÊý¾Ý£º
ÊÔÑé´ÎÊý | 1 | 2 | 3 | 4 | 5 |
µçѹ | 2.5 | 2.0 | 1.5 | 1.0 | 0.5 |
µçÁ÷ | 0.22 | 0.19 | 0.16 | 0.1 |
£¨1£©ÔÚÁ¬½Óµç·ʱ£¬¿ª¹ØÓ¦¸Ã´¦ÓÚ______£¨Ñ¡Ìî¡°±ÕºÏ¡±»ò¡°¶Ï¿ª¡±£©×´Ì¬¡£
£¨2£©µÆÅÝÕý³£·¢¹âʱ£¬µçÁ÷±íµÄʾÊýÈçͼÒÒËùʾ£¬ÔòСµÆÅÝÕý³£·¢¹âʱµÄµç×èÊÇ_________________£¨½á¹û±£ÁôÁ½Î»Ð¡Êý£©¡£
£¨3£©ÎªÁËÍê³ÉÕâ5´ÎʵÑ飬Ӧ¸ÃÑ¡Ôñ×î´ó×èÖµ²»Ð¡ÓÚ______________µÄ»¬¶¯±ä×èÆ÷¡£
£¨4£©Ä³´Îµ÷½ÚÖУ¬Èô»¬¶¯±ä×èÆ÷µÄ×èÖµ¼õСÁË¡÷R1£¬Ð¡µÆÅݵĵç×è±ä»¯ÁË¡÷R2Ôò¡÷R1______¡÷R2£¨Ñ¡Ìî¡°´óÓÚ¡±¡¢¡°µÈÓÚ¡±¡¢¡°Ð¡ÓÚ¡±£©