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Modern Electrical Installation for Craft Students, 3rd Edition
book

Modern Electrical Installation for Craft Students, 3rd Edition

by Brian Scaddan
November 2013
Intermediate to advanced content levelIntermediate to advanced
182 pages
6h 6m
English
Newnes
Content preview from Modern Electrical Installation for Craft Students, 3rd Edition
12 Inductors and inductance
/(common)
Diagram 14
V
R
to obtain V. The reason for this is that in the inductive part of the
circuit the common current / is out of phase with V
L
and in the resistive
part / is in phase with V
R
. V
L
and V
R
can only, therefore, be added
graphically (or by phasors) as in Diagram 14.
By construction we can see that V
R
is in phase with / and V
L
is 90°
out of phase with /, and that the resultant is the applied voltage V. θ° is
the number of degrees that / lags behind the applied voltage V.
From Diagram 14 it can be seen that the triangle abc is right-angled,
having ab = V\ be = V
L
and ac = V
R
. Hence by Pythagoras' theorem ...
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Publisher Resources

ISBN: 9781483106205