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Principles of Analog Electronics
book

Principles of Analog Electronics

by Giovanni Saggio
January 2014
Intermediate to advanced content levelIntermediate to advanced
567 pages
23h 13m
English
CRC Press
Content preview from Principles of Analog Electronics
Two-Terminal Components
143
and for the sake of simplicity we can adjust the origin of time so that
0
i
ϕ=
:
co
sc
ospt vtit Vt
It
VI
()
() ()() ()
==ω+ϕ−
ϕω
Now, recalling Werner’s formulae for trigonometry
(
co
scos
1
2
AB
() ()
=
))
((
[−++]coscosAB AB
)
the equation can be rewritten as
1
2
cos
1
2
cos2pt VI VI t
MM VI MM
VI
()
()
()
−ϕ
−ϕ
The term
VI
ϕ−ϕ
is dened as phase shift while the constant term of the equa-
tion, i.e.,
1
2
cosVI
MM
VI
()
ϕ−ϕ
which does not depend on ω, is exactly the real power. This can be both positive
(in which case we talk about dissipated power) and negative (in which case we
talk about supplied power).
Recalling that (Section 1.2.5 in Chapter 1)
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Publisher Resources

ISBN: 9781466582026