§ 7-6 Phasor relationships for R,L and C
i
?? ?
R ?I
?? ?V
R
Ri??
)c o s (2)c o s (2 ????? ???? tIitVif
)c o s (2)c o s (2 ???? ??? tIRtV
),( p h a s eini
RIV
???
???
???
??
?? ? IRV
R：
R1
2
V+
V-
V1
F R E Q = 5 0
V A M P L = 3 1 1
V O F F = 0
0
I
Time
0s 10ms 20ms 30ms 40ms 50ms
V(V1:+,0) -I(R1)
-400
0
400
L：
dt
diLt ?)(?
??? ??? LIjV
?? ? ILjV ?
jje j ??? ??? 90s i n90c o s90
?90byIl e a d sV ??
)( ??? i m p e d a n c eLj?
（阻抗）
cer e a ci n d u c t o rL t a n???
（感抗）
?? )( t?
)(ti L
?I
?? ?V
L
?I
?V
)c o s (2
)c o s (2
??
???
??
??
tIi
tVif
)s i n (2
)c o s (2
???
??
???
?
tIL
tV
)90co s (2 ???? ??? tIL
R2
0, 1
V+
V-0
L1
0, 0 1 H
1
2
I
V1
F R EQ = 5 0
VA M PL = 3 1 1
VO F F = 0
Time
1.00s 1.01s 1.02s 1.03s 1.04s 1.05s
I(L1) V(L1:1,0)
-400
0
400
C,Ci
???
C?I
?? ?V
dt
dCti ??)(
??? ??? CVjI
?? ? VCjI ?
??? ??? I
CjICjV ??
11
?90byVl e a d sI ??
)(1 ???? i m p e d a n c eCj ?
?I
?V
cet a nr e a cc a p a c i t o rC ??? ? 1 （容抗）
)c o s (2
)c o s (2
??
???
??
??
tIi
tVif jje j ??????? )90s in()90c o s ()90( ???
?90??? byIl e ad sV
)s i n (2
)c o s (2
???
??
???
?
tVC
tI
)90c o s (2 ???? ??? tVC
V-
I
C1
2 0 0 0 u
0
V+
V1
F R EQ = 5 0
VA M PL = 3 1 1
VO F F = 0 R2
1 0 0
Time
0s 10ms 20ms 30ms 40ms 50ms
-I(C1) V(V1:+,0)
-400
0
400