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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
a.c. circuits 197
R
Figure
11.25
Figure
11.26
From figures 11.24, 11.25 and 11.26 we have
V
R
70.13
p.f. = = = 0.7013
P
V 100
R
5
p.f. = - = = 0.7013
P
Z 7.13
V
R
1 983.72
p.f. = = = 0.7013
F
VI 1403
Phase angle
<}>
= arcos 0.7013 = 45.5° (0.793 radians)
Note from Figure 11.26
cos
<f>
=
VI
.
X
(VL ~ Vc)l
sin
<b
=
VI
VI
cos
<j>
= V
w
/ = true power
VI
sin
<f>
= (V
L
V
c
)/ = reactive power
Note: from the phasor diagram, Figure 11.24, we see that the
current lags the applied voltage by the angle 4>.
198
Circuit calculations pocket book
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Publisher Resources

ISBN: 9781483101132