
22-6 Electrical Variables
Equation 22.12. In particular, from voltage drops v
AB
and v
BC
, the load current and load voltage can be
directly derived; instead, v
AC
is used to retrieve information about their relative phase.
If currents derived by voltmeters are neglected and the current i
L
owing into the load L is assumed to
be equal to that owing into the resistor R, the statement can be demonstrated as follows:
v v Ri
v R i v Rv i
AC L L
AC L L L L
= +
= + +
2 2 2 2
2
(2
2
.16
)
where
th
e
sm
all
ch
aracters
in
dicate
in
stantaneous
va
lues
. By co
mputing
rm
s
va
lues
(i
ndicated
as ca
pital
ch
aracters),
o
ne
o
btains
t
he
p
ower
P
L
:
1 1 1 1
2
2
0
2
0
2 2
0 0
2 2
T
v dt
T
R i dt ...