§ 1-6 source transformations
The ideal voltage source and a series resistance comprise a
practical voltage source.
cetanr e s i se r n a li n tR s ????
Ls
s
L RRi ??
?
?
Ls
Ls
LLL RR
RiR
??? ?
??
A practical current source is defined as an ideal current
source in parallel with an internal resistance Rsi.
s
Lsi
Lsi
L iRR
RR
???
s
Lsi
si
LLL iRR
RRi
??? /?
LR
Li
?
?
L?
?
?
s?
Rsv
LR
Li
?
?
L?
si
Rsi
We shall define two sources as being equivalent if
each produces identical current and identical voltage
in any loads which is placed across its terminals.
Conditions of equivalence:
Ls
s
L RRi ??
?
?
s
Lsi
si i
RR
R
??
ssis RRR ??? ?Example:
Ai L 1)42 2(3 ??? VL 4?? Ai L 142
6 ?
?? VL 4??
P4=4W,
P6V=6(1)=6W.
P4=4W.
P3A=4(3)=12W.
?
?
V6
2 Li
?
?
L?
42
Li
?
?
L?
4
A3
sss iR??