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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
Principles of Analog Electronics
108
4.4.8 Joule’s Law
Let’s apply the electric power denition, P = VI, to the
case of a resistance, and since we know Ohm’s law,
V= RI, we get
PV
IRI
V
R
2
2
== =
so from the value of R and the voltage V across it, or
from the current I owing through it, it is possible to
identify the value of the dissipated power.
Example
We can apply the equation of electric power to the case of a common lamp, 100 W,
fed with the house voltage of 110 V. Its lament resistance is R =V
2
/P=121 Ω,
and the current owing is I =P/V0.91 A.
The power we are talking about is completely dissipated in the resistor.
Infact,when the cur ...
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Publisher Resources

ISBN: 9781466582026