Vf
dylO:
Ap
dl,lllg
phuong
phap d6ng
d.i¢n
nhAnh.
tInh
d6ng
di~
trong
clic
nMnh
cua
m~h
di~
hbih
1.38.
LM
giil
:.
Bubc
1:
M~ch
d.i¢n
c6 2
nut A
vA
B,
56

2
,
13
nhu hlnh 1.38.
BllUC
J:
S6
mit
eM vitI phuong trlnh
KieeshOp
1
IA
n
-1
=. 2 - 1 =. 1.
GlI;m
mit
A.
PhU't1ng
lrlnh
KieeshC p
1 vitI eho ndt AlA:
1
1
-1
2
+1]=0
(1)
Buuc 4:
ChQn

22
12
=
10
Ml,lch
voog b
2212 + 6813= 5
Bubc
5:
Oiai
h¢
3 phuong lrinh
ta
c6 d6ng di¢n
cdc
nhAnh
11=138mA
1
2
=
160mA
13=
22
mA
(2)
(3)
Phuong
pMop
dong di¢n nluinh
giai

s6
trung
gian
III
dong
di~n
m~ch
vong, di¢n the'
mH,
do d6
s6
phuong trlnh
sf!!
dugc
giam
b6t,
nha
vj).y
tie't.ki¢m thOi gian tfnh
toano
2. PhlJang phlip dimg
di~D
m,ch
vbog
o phuong pbap
n~y.
an
,6
trong M phuong
"lnh

(m-n+l)
mE.Lch
vbng
d~c
I~p
yA
tuy Y
vi!
chi~u
dong
di¢n
m~ch
yong.
thOng
thuang nen
ch<;ln
chi~u
cd.c
dbng di¢n
m{lch
ybng
gi6ng nhau,
thu~n
ti¢n cho
I~p
h¢
phuong trinh.
Bwc
2 :
Vi!!'t

s6
dong di¢n
m{lch
yong
ch{lY
qua nMnh
Ay.
Vi
dl,lll
:
Ap
dyng
phl.l'Ollg
phBp
dbng di¢n
m~ch
vbng giru
m~ch
di¢n hlnh
1.39.
Lbi
giai :
BElue
1 : Sd
m{lch
vbng
dQc
l~p
:
I,

vbng
a
(47
+ 22) I. - 22
Ib
=
10
691 22Ib
=
10
M,!-ch
vbng
b -
221.
-+
(22+ 82)l
b
=
-5
=
·5
BItCle
3 :
Giii
h¢ phuong trlnh dii thi!!t I$p
1
691
••
221. =
10

22)
22
104
BUde 4 :
nnh
dllng di¢n nhanh
II
==
I.
==
139 rnA
12
==
I.
-Ib
==
139 - (-18,7)
==
158rnA
Il
==
Ib
==
-18,7
~A
Dllng di¢n
Il
<
O.
do d6

Bit!t di¢n tht!
cac
m1t,
ta
d!
dang
tinh dllng di¢n
cac
nh8.nh.
Xet
m~ch
di¢n hlnh 1.40.
A
I3
3300
•
I,
·3
·2
.,
=c
Hl"h 1.40.
M$Ch
dien
de
tloh
di~n
,bl! nllt
Tuy
'9

II = EI
-~A
14
=
'1'8
RI R
4
.
12
=
'£&.
R2
I
!jlA
-'1'8
3-
R3
Djnh
Iu:}t
Kiecsh6p
1
~i
nlit A
I, -
11
-
13
==
0
21

<PA
-<PB
lPs
_
Es
+CPB
=0
R3
R4
R,
(
__
1
).q>A
+(_1
+_1
+_1
).q>B
=_(_1
).E,
R3
R3
R4 Rs Rs
Goi:
GA
=(_1_+_1_+_1_)
-
TOng
dAn
cUB

DIll
A
va
B.
1
01 ". - -
Di~n
dAn
nMnh
1.
Rl
1
G,
= - -
Di~n
dAn
nhlinh 5.
R,
H¢
phuong
trlnh di¢n the'mll se
la
GAlPA
-GABlPB
=G,El
-GABCPA
+GBCPB
=-GsE
S
Giai

Bltae
3:
Tfnli
t60g
din
cua
c.6c
nluinh n6i
VOl
mOi
n6t
GA.
Go
vh t6ng
dAn
chung cua
c.6c
nMnh
giii'a 2 nlll
GAD
."
va
di¢n
dAn
c~c
oMnh
c6
ngu6n
G"
Os.

RJ
R2 R3
470 680 330
0D
=(_1
+
_1_
+
_1_)
~
(_1_
+_1_+_1_)
'"
0,01403
RJ
R4
RS
330 1000
100
GAB
~
(_I
)
~
_1_ = 0 0030)
RJ
300
•
I I
Gl=-~

c'c
nh4nh
II
=
E,-f(lA
_ 4,.5+0,928
-O,01l55A
Rl 470
IpA -0,928
12
= !.Q.=-=-Q
OOl36A
RZ
680
'
I '"
'PA
-CPR
'"
-0.928+5,19
=0
0l29JA
3
R2
330 '
".!ll.

-5,19 =
-0
OO.519A

d!
dAng
tinh di¢n the' clla nut.
CbQn
<P!:.I
:
O.
v~y
chi
cOn
di¢n
tM
nut A
IA
a:n
s6.
GA<PA
=
OJ
E
J
+ G
3
E3
1,
•
A
, , ,
47
I,

di~n
tM
nut A
Ill.
0,078921j)A
= 0,27374
OW
ra
ta
c6:
<PA
=
3.468
V
DOng
di¢n cae nhlinh
I
""
B'-<PA::
10-3,468
o.139A
I
RI
47
'2
= 2A."'~:0
158A
R2
22
'

Om.
1.3. Phat
bi~u
djnh
'Iu~t
Ki6esMp.
1.4.
Cae
bllOe
giai
m~eh
df$n
bl!ing
phl/ljng phap
dOng
cJi$n
nMnh.
1.5.
Cae
bllOc gilll
m~ch
di$n bling
phU'c1ng
philp di$n
th~
cae
cJi&m
nut.
1.6. Cho E '" 100V ; R =
10n

b) U
BA
=
50V
1.7.
Cho
E =
SOV';
R =
SO;
U
=-
40V.
Tfnh
dong
d'i~n
I
trong
2
sd
<16
hinh
BUa
v~
BUb.
E
U
f)ap
slf
;

=
10.
Tlnh dong
<l1~n
I,
<l1~n
ap
U
v~
cOng
su~1
P
caa
b\i.
f)ap
slf:
I = 5A ; U =
95V
; P =
475W
.
1.9. Cho
mQt
ngut'Sn
di~n
mt)t
chieu
c6
sac
di.n

di~n
lip U gilta 2
cl,I'C
eua ngu6n di$n,
di~n
trO
R
vtl
cOng
su§t P
tai
tiAu
th

f)ap
slf:
I = 10
A;
U =
49V;
R =
4,9n;
P = 490W.
1.10.
~Qt
ngu6n
di.n
c6
sac
di~n

R.
f)ap
slf;
E =
tOOV;
R =
9,5n.
25
1.11. B6n di';n Irtf R
1
,
R
2
•
R
3
•
R4
m~c
n6'i
liA'p
d.!iu
vilo nguon di';n ap U
12V
(d1';n
Ira trong bling khOng).
DOng
di~n
trong
m~ch

U
4
IrAn di';n Ira R
4
. Tfnh di';n Ira
Rlo
R
2
•
R
3
•
Rt
.
.
D(1p
s6:
U. =
2V;
R
f
=
100n

R2
=
120n
1.12.
8i4ft
56 chi cua mtit

R,
•
I,"
Hlnh 81.12
R,
R,
1.13.
£>4
c6
c:Jl';n
Irtf (luang duong) 150 O.
ngl.l'Oi
la
da"u
song song hai
di';n Irtf Rl = 330 0 vtl R
2
.
Tfnh
R2
fJap
slf:
R,
=
275n.
1.14. Hai di';n Ira
Rl
=
1000
vtt

S.
Dung phap bi6n ddi
tllOng duong,
tfnh
dOng
di~n
Irong cac
nMnh
IrAn so d6
hlnh 81.15.Tlnh
cOng
suA't
ngu6n vtl
cOng
suA'1
IrAn cac
di~n
tr~.Cho
U =
SOV
; R=
1,25n;
R,
=
6n;
R, =
Ion.
fJflp
slf
:

R2
=
360
W
Ta
thdy
P = P
R
+ P
R1
+ P
R2
1.16. Tfnh dbng
di~n
I
v~
cOng
suA"t
ngu6n
trong
Sd'
a6
hinh B1.16. Cho U = 120V ;
R
1
=
R2
=
R3
=

2
phU'd'ng
phap
sau :
a)
PhU'd'ng
phap
dbng
di~n
nhanh.
b)
PhU'd'ng
philip
cJI(m
th~
cae
nut
(chQn
di6m
nut
8 c6
di~n
th'
bAng
khOng).
Cho
El
=
200V;
Rl

hlnh
81.17.
a) " = 10A ;
I,
=
9A
;
12
= -1A
(chi~u
d()"g
c.1ifn
12
(nhanh
2)
nglf9G
veji
chi8u
IIA
vA).
b)
L~p
phllOng Ir/nh
lIi~n
1M
nUt
A,
glili
r.
~A