1
EE201 Linear Circuit Analysis I
Lecture 3.
Topics:
passive sign convention, power conservation, resistance, Ohm’s Law.
1.
Review of Passive Sign Convention
Q.
Why the name Passive Sign Convention?
A.
A “passive” circuit element is one that (on the average) must dissipate energy.
So when
P=VI is computed for a passive element, we would expect that P>0 if P = power absorbed.
If
labeled with the passive sign convention, such will happen for the passive circuit element.
(Prof. Krogmeier, ECE)
P
AB
= V
AB
x I
AB
= power absorbed
by circuit element with terminals labeled A and B.
Practice Problem 1.
Given a twoterminal element, how many different ways can you mark the polarity of voltage
and the direction of current?
Of these, which one(s) follow the Passive Sign Convention?
(
Feel free to discuss amongst yourselves
.)
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2
Practice Problem 2.
Compute power
absorbed
(or
dissipated
) by elements #1, #2, #3.
Of the three elements, which element(s) could be the source(s)?
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 Spring '08
 ALL
 Resistor, Electrical resistance, Electronics terms, passive sign, electrical components

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