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q

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Title: No Slide Title Author: Sukit Last modified by: Case Created Date: 1/13/2003 3:49:14 PM Document presentation format: On-screen Show Company – PowerPoint PPT presentation

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Title: q


1
????? 3 ??????????????????????????????
??????? ????????????????????? ?????????????????? ?
????????????????????????? -gt??????????????? (?????
?????????????????)
q
E

2
q
E

?????????? (I) ??? ????????????
????????????????????? C/sec ???? Ampere
?????????????????
??????????????????? ??????????????? /m3
??????????????
??????????????????? (????????? e)
3
????????????????(J)
???????? ?????? n 8x1023 cm-3 vd 0.03 cm/s
s ??? ??????????? (conductivity)
L
A
q
E
V
4
??????????
?????????????Volt
Ohms Law
??????????? Ohm
????? Ampere
??????????? r ?????????????????
???? gt0 ??????????????? lt0
5
?????????????
V
???????
?????
??????????
6
????????????
??? VA gt VB ????????????? A ?? B
VB
i
VA
B
A
???????????????
E
s
I
r
R
V
I
7
???????? ????????? Load, R ???????????????????????
?? ??????????????????????????????
I
r
R
????????? Load ???????????????????????????????????
??????? ????????????
8
????????????????
????????? (Serial)
R1
I1
Rs
I
V
I2
R2
V
9
????????????????
I
I1
??????? (Parallel)
I2
R2
R1
Rp
I
V
V
10
????????
R1
I
R2
V
I
Rs
V
11
????????
R ????????????? 6 ????? R ?????????? A, B
???????????
R
A
B
A
R
R
R
R
RP
R
B
B
A
12
????????
A
3W
6W
4W
2W
B
13
????????
???? RAB
???????????????????????????? AB ????? ???????? X
??????? ???????? Y
A
6W
2W
5W
X
Y
????????????????????????????????????? 5
W ?????????????????????????????
1W
3W
B
14
????????????????(Kirchhoffs law)
1. ????????? ???????????? ??????????????????
I1 I2I3
I1
I2
I3
I1 I2I3
I1
I2
I3
2. ????????????????????????????????????????
R
I
15
?????????????????????????????????????
????????
B
C
Loop ABEFA
A
6W
I2
I1
2W
24V
Loop EBCDE
4W
D
E
F
12V
??? 2 ????? 2 ?????? ???
???????????????????? I2 ??????????????????
16
????????
?????????????????????????????????????????? VXY
Loop AXBA
A
8 V
I1
3W
Y
X
I2
Loop AYBX
13V
6V
10W
B
Loop YBX
???????? Y ??????????????? X ???? 27 V
17
???? RC(RC-circuit)
q
R
C
I
RC ??????
?????????????? s ??????? ????????? I ?????????
C
I
R
????? I(t) ? ??? q(t) ?
s
18
I
R
s
????? charge C ??????
19
q
t
0
RC
2RC
3RC
4RC
20
I
RC t time constant (second)
????? charge C ?????? ??????????????
t
0
RC
2RC
3RC
4RC
21
???????? C ??? charge ????????? Q0 ?? q(t) ???
I(t) ???????????????? s
???? RC ????????
Q0
I
(????????)
R
C
-Q0
s
22
q
RC t time constant (second)
t
0
RC
2RC
3RC
4RC
23
I0 Q0/RC
q
t
0
RC
2RC
3RC
4RC
24
????????
??????????????????????? ?????????????? t 2.2
s ??? R 200 kW ??????? C
Q0
I
R
C
-Q0
s
25
????????
??????????? q/C ????? 8V (?????????
C) ??????????????????????? charge ??? q/C 10 V
I
R
s
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