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?2008??22?????????????????
?1?????10?????????????
?2???????10 mA??????????mA?
?3???????5V?????????? V?
?1?60?2?7.18?3?3.59
?2009???22??????????1?2?3?4?5?6?????????????????????????????????????????????????????3??????????????
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?2?????????????5?6?????????????????? ___?????
?3?????????????????????????????????
?1???????2???????5?6?3????????????????,????????????????????,??????,????????
?2009???22??????????????????????????????
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?2??????????????????????????????????????
?3???????___________????????
?4?????????__________??????????_________????????????????
?5?????????????????????????___________?????????????????????????????????????3???4??
?6??????????????_____________________________???
?3????4?????5????6?OFF
?2009??15??1?????????????????k????Rx?????????????????S??????P??????????????????????????????????????
a??????????P??????????????????????
b????????????????????Rx??????????
c???S??????????1k
d???S??????????100
e???S????????500V????????__________________?
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?2????????????????????????????? ?
A?????????????????????S?????????????????
B????????????????????????????????
C???????????????????????
D??????????????????
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?2009??9????????????????????????IR?300?A,??Rg?100??????R??????10k????????E?1.5V,??r?0.5????????A????????? ?????????????Rx??????????????????Rx? k???????????????????????????????????????????????Rx???????????? ????????????
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????? R?????????????????????????????
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????????????????????100????????????????????????0????????????????100?????????? ????? 1?2 ? 1?
?2011????23????????????????????????????????????????????????????????????????????????????????????????????????????????60 mA?????????????????????????1?????????????????????????
?1???????l???a?b?????????????????????????a
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?2????????????1????????????????????2?a???b???c?????????????_________?????????_________mA????????_________??
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?2011??21???????????????????????K?????S?T??????????????:
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A??K??????1k??? B??K??????10???
C????????????????????????
D??????????????????????
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?2011??34????????????????????????????2.5V?0.6W?????????????????????????????? ?????????????????________??????????1?10?100?????????????????????????1????________??
???????????????
?2010?????22?1??
??????????????????????????E?G????F?G????????E?F???????????????????????????????E????????????????????F????????????????????????????????? ?
???B
?2009??????15?
?1?????????????????k????Rx?
????????????????S??????P??????????????????????????????????????
a??????????P?????????????????????? b????????????????????Rx?????????? c???S??????????1k d???S??????????100
e???S????????500V????????__________________? ?????????????????????__________?? ?2?????????????????????????????
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?A?????????????????????S?????????????????
?B???????????????????????????????? ?C??????????????????????? ?D?????????????????? ???15??1?c?a?b?e?30k??2?A?C
?2009?????21? ???6?????????????????????a?b????????????????????????????????a?b????????????????
???
???????100mA?????0?10????????2mA???1mA?????
????2.5V?????0~250?????????0.05V???0.01V???????100????????????????3.2????100? ?2006?????22?2??
?2???????????????????1?10?100??10?????? ??????????????????????????????????????????????????????????????????? ???????????????????????????______?
?2?100???????????2.210 3 (? 2.2k)
?2006?????22?1??
22.(17?)??????????
(1)??????????????10????????????????
?22?1?????????????___________????????????1 mA??????????22?1?????????_________mA? ??? 220 ?0.40 mA ?2005?????22? ?????p51 ?9?
?1985??(2)??????
????????????.S?????,Q????????.??????????????(???????),???????R1=60??R2=470k?.???????????????????.??????????????????????????????????,??????????????????????.
A.??S?????????1k(?OHMS1K). B.??S?????????100. C.??S?????????10. D.??S?????????1. E.??S??????V1000.
F.????????R1???,??R1???.?????. G.????????R2???,??R2???.?????. H.?????,??Q?????????????0,?????.
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????:???5?,DHF?AHG??2?,???E?1?.???AHGDHFE?,????.?DHF??CHF?,?1?,?AHG??BHG?,?1?.??????H(????0)?,?1?;??H???,?3?. ?1989????4????????? ????????????????????
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?????????????????????????12?B??????????????____??????12?C??????????????a??____??
b
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?1990???27????????
???????(100)????????????????????????????????????????????????____??
(27)??1???a?2???
?1991????28???????
?????????4?,???1?,10?,100?,1000?,???????????.??100?????,???????????. ??????????,????????????,? ,?? ,????????.
28.(?)???????1000??,(??)?? (4?)
(??????????,????????1000???,????????????????0?)
?1993????9???????????
???????????????????????????300?A???rg=100W?????????R=50k?????????R0=50????????=1.5V???????Rx????????????()
(A)30k??80k? (B)3k??8k? (C)300??80? (D)30??80? 9?B
?1995????26??????
???????????????????,????????12,??????____.??????????????200????,?????????,???????????____.
33
26.1.210?(3?,??1.210
??1200????;???????)10(2?)
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发表于 2019-9-13 23:46:11