
23-6 Electrical Variables
0 90 180 270 360
1
2
–
3
–
+
4
+
Power
Average power
Voltage
Current
FIGURE 23.4 Voltage, current, and power for sine waves 60° out of phase. e vertical scales for voltage and
current amplitudes are the same as those for Figure 23.3. Current lags voltage by 60° and both are sinusoidal. e
po
wer
is po
sitive
in reg
ions
(2
)
and (4
)
and neg
ative
in reg
ions
(1
)
and (3
)
. Av
erage
po
wer
de
livered
to do wo
rk
is
les
s
t
han
t
he
m
aximum
p
ower
.
0 90 180 270 360
1
2
–
+
3
–
4
+
Power
Average power
Voltage
Current
FIGURE 23.5 Voltage, current, and power for sine waves 90° out of phase. e vertical scales for voltage