找回密码
 立即注册
查看: 98|回复: 0

???????????

[复制链接]

0

主题

0

回帖

56

积分

管理员

积分
56
发表于 2019-9-13 23:46:11 | 显示全部楼层 |阅读模式
?????????(????)?????

1-9????????????

?1????A????10W???Ua=? ???????????????????

P?UaI?U

a

?

PI

?

10W1A

?10V

?2????B????10W???Ib=? ????????????????????

P??UI

b

?Ib??

PU

??

10W10V

??1A

?3????C????-10W???Ic=? ???????????????????

P?UI

c

?Ic?

PU

?

?10W10V

??1A

?4????D?????P=?

????????????????????

P??UI??10mV?2mA??20?10

?6

W

?5????E??????10W???Ie=? ???????????????????

P?UI

e

?Ie?

PU

?

?10W10V

??1A

?6????F?????-10W???Uf=? ????????????????????

P??UfI?U

f

??

PI

??

10W1A

??10V

?7????G?????10mW???Ig=? ???????????????????

P?UI

g

?Ig?

PU

?

?10mW10V

??1mA

?8?????H??????

????????????????????

P??UI??2V?2mA??4mW

??????4mW?

1-11.????????????390????????????????100V??????????????????????1/4????390?????????1/2????390?????????????

??????????????????

P?

U

2

R

?

100390

2

?25.64W

???????????????

1-14?????????????????????????

3V

3V

3V

3V

(a

)

(b

)

??1-14

(c

)

(d)

???a???????????????????P?UI?3V?2A?6W;

?b????????????????????P??UI??3V?2A??6W,???????6??;

?c????????????????????P??UI??3V?2A??6W,

???????6??; ?d???????????????????P?UI?3V?2A?6W.

1-19.???????????I??????US?????R? ??

1.???????12A???????a??d????????? ?1? ???I:

I?6A?5A?1A

?2? ???US:

Iba?15A?1A?14A

??1-19?1?

?a???KCL???

?Iac?Iba?5A?12A?0

???? Iac?Iba?5A?12A??3A ?? Uac?12??Iac?12????3A???36V ????? Udc?3??Idc?3???12A?6A??54V ?? Uda?Udc?Uac?54V???36V??90V ???? US?Uda?90V ?3????R:

Uac?Ucb?Uba?0

?? Uba??Uac?Ucb?36V?1??15A?21V ?? R?2.???????12A???????d??a????????? (1)???I:

I?6A?5A?1A

U

ba

Iba

?

21V14A

?1.5?

(2)???US:

Iba?15A?1A?14A

?a???KCL???

?Iac?Iba?5A?12A?0

??1-19?2?

????

Iac?Iba?5A?12A?21A Uac?12??Iac?252V

?????Udc?3??Idc?3???6A?12A???18V ??Uda?Udc?Uac??18V??252V???270V ????U

S

?U

da

??270V

?3????R:

Uac?Ucb?Uba?0

??Uba??Uac?Ucb??252V?1??15A??267V ?? R?

UbaIba

?

?267V14A

??19.07?

1-27.?????????A?????

??????????????????KCL?????

I1?I2?I3

?50V

IA

??

50?UA

10

?

UA???50?

5

?UA?020

I

R25??

?????

U

A

??14.29V

?50V

??1-27

1-41 (1) . ???????i1?uab?

i1

????5?????????

.9i1

0.9i1?

10V5?

?2A?i1?

20.9

A?

209

A

uab?1??iab?1???i1?0.9i1??1??0.1i1?0.1?

209V?

29V

b

??1-4-1

?1?

1-41 (2) . ???????uab?ucb? ????uab? uab??uba??3V ??ucb? u1?5??2A?10V ???????i2?0.05u1?0.5A

2A

0.05u1

??1-4-1?2?

uac?20??0.5V?10V ucb?uca?uab??10???3???13V

1-41?3?.???????U?I1?I2? ??????a?KCL???

4A?0.25I1?I1?I2

?????

I1?

U5?

4A

I

2?

?I2?

U4?

b

??1-4-1?3?

??????

4A?0.25?

U5?U5?U4

???

U?10V

U5?

105

U4?

104

?????? I1?

?

?2A?I2?

??2.5A

1-42?1?????????I2? ?? ????????????

3I1?6I1?0

I1

????I1?0

???3?????????0?????

9V?6??I2?I2?

96

?1.5A

??1-4-2?1?

1-42(2) ????????????????

??????a?KCL???

6A?0.8I1?I1?I2

0.8I1

I12?

??? I1?I2 ??????? 6A?0.8I1?2I1 ??? I1?5A ?? Uab?2??I1?10V

b

??1-4-2?2?

??????????????????(???)???

???????1?????????

?1?

1.1???

1.????x1.1???US??????? ??????????R???????? ? C ??

A.???U???B.????I???

C.??R???????

D.????????

2.???R?u?i?????????????????????? B?? A.u?Ri C.u?Ri

B.u??RiD.u??Gi

3.??x1.2??????A???? ??? D ??

A.6VC.8V

B.?4V

D.7V

4.??????????x1.3?????U???I????????????C ?? I??1A??????????

A. U?I????????I???????A??B B. U?I????????I???????B??AC. U?I?????????I???????A??B D. U?I?????????I???????B??A

5.????x1.4???US?10V,R?5?????? ????A ??

A.???????20W???????20W B.???????20W???????20W C.???????500W???????500W D.???????500W???????500W

6.????????????????????10kW???????????1kV,???????????B??

A. -10A B. 10A

C.-10mA

D. 10mA

1.2???

1.?Uab?12V?a???Ua?5V??b???Ub?V???????

?????????????

2.KCL?????????? ?? ????????????KVL?????????? ?? ????????????

3.????????????????????????????????????????? ??????????

4.????????????? ?? ????? ?? ??????????????? ?? ??????? ??

5.????220V?40W??????110V??????????? 10 W? 6.?????????????????????????? ??? ?

1.3 ???

1. 1C???a?b?????1J???1??????????????2??????????????3??????????????4??????????????a?b??????Uab? ????W?Uabq

?1?1?1?Uab???Uab?1V ?2??1?1?Uab???Uab??1V ?3?1??1?Uab???Uab??1V ?4??1??1?Uab???Uab?1V

2. ??x1.5????????????????????????????a???????30W????b???????20W????c???????-40W????????

ua?ub?ic?

a

+ua

?

b

a

+ub?

b

a

b

? 5V +

?a? ?b? ?c? ?x1.5 ???2? ???a?p??30W,? p?uai?ua?4?ua??7.5V

?b?p?20W,? p??ub?i??ub?4?ub??5V ?c?p??40W,? p?5?ic?ic??8A

3. ??x1.6???????????????????????????????

????x1.6a???i1R?30?0???i1?3A

i?1?i1???i?2A

P(30V)??2?30V??60V?????? P(1A)??1?30V??30V??????

4. ??x1.7???????????

????x1.7a???

5?(?3)?8?i1?0 ?? i1??10A

i1?5?1?i2?0 ?? i2??4A i3?10?2?i1?0 ?? i3??18A

1?i4?8?0 ?? i4?7A

5. ????x1.8????????UAD, UCD, UAC?

2A

2A

?x1.8???5? ?x1.8a ???5???

i1??5A, i2??4A,i3?i2?i1?1A????x1.8a???

UAD?UAB?UBD?i2?3?i3?1??11V

UCD?UCB?UBD??i1?2?i3?1?11V

UAC?UAB?UBC?i2?3?i1?2??22V

6. ??x1.9????????K??????A????????

1A

K

?a? (b) ?x1.9 ???6?

K

?x1.9a ???6?a????

?? ?a???S???A?????UA?6V

??S???A?????UA?3V

?b???S???A?????UA?0V

??S???A?????UA?1V 7. ??x1.10????I1?I2?I3?I4?

2

?1A 23

I6??1A

31

I7??0.2A

5

I2?I7?I5??0.8A

??I5?

I3?I7?I6?1.2A

I1??1?I2??0.2A I4?1?I3?2.2A

8. ???x1.11??????

us?20V?R1?6??R2?6??R3?5?

????i? ??

5i?0.1i?6?20

? i?

20

?3.57A5.6

9. ???x1.12?????I1?I2?U2?R1?R2?US? ??Us?5?6?0???Us?11V

I3?

3V

?1.5V 2

I1?I3?2???I1?0.5A

R1?

5

?10? I1

I1?I2?2???I2?1.5A U2?5?3?0???U2?2V

R2?

U24

??I23


????????????????????
?????http://www.850500.com/news/5543.html
?????,??!
您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

Archiver|手机版|小黑屋|Discuz! X

GMT+8, 2026-3-7 15:47 , Processed in 0.485937 second(s), 19 queries .

Powered by Discuz! X3.5

© 2001-2025 Discuz! Team.

快速回复 返回顶部 返回列表