9
Sinusoidal waveform showing instantaneous values voltage.
For any sinusoidal waveform the rms value equal 0.
V
V V
V
av max
6
1 6
0 637
.
.7071 the maxi-
mum value.3 V.
The rms value the square root the mean the individual squared val-
ues and the value a.
Example
The sinusoidal waveform applied particular circuit has maximum value 325. .637 the
maximum value.9.3V but because the rms value gives the d.
For any sinusoidal waveform the average value equal 0. equivalent value almost always give the
rms value without identifying such.
⬖
l
lue
V
rms max
rms
V V
V
7071
0 7071 325 230
. 4.9.
V
V V
V
rms
max
1
2
2
2
3
2
4
2
5
2
6
2
6
0 7071
. voltage which produces the same heating
effect d. . voltage.
When say that the main supply domestic property 230V, really mean 230V rms.2V and maximum value almost
325.Basic electrotechnical units and theory
95
The average value the average over one half-cycle the instantaneous
values they change from zero maximum and can found from the
following formula applied the sinusoidal waveform shown Fig. 4.
Average value
V
rms va
av max
av
V V
V
637
0 637 325 207 2
.c.c.
Such waveform has average value about 207.
.
90
30
180
150
120 60
V
V
V1
V5
V6
V2
V4
V3
FIGURE 4.
Calculate the average and rms value the waveform.c. The value can found from the following formula
applied the sinusoidal waveform shown Fig.
