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Circuit Theorems
Superposition:
the voltage across (or current through) an element in a circuit made up of linear
elements and sources is equal to the sum of the voltages across (or current through) that element
caused by each independent source acting alone.
Ideal passives (capacitors, inductors, and resistors) are all linear elements.
Superposition Steps:
•
Turn off all independent sources, except one.
Find the voltage(s) or current(s) necessary
for the solution.
•
Repeat the first step for all independent sources.
•
Sum the values found for each source to determine a voltage or current through a given
element created by the circuit as a whole.
•
Use these final values to calculate any nonlinear quantities, such as dissipated or
supplied power.
Source Transformation:
A voltage source in series with a resistor can be interchanged with a
current source in parallel with the same resistance, where the current, voltage, and resistance are
related by Ohm’s law.
The orientation of the current source should flow from the negative to
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This note was uploaded on 11/02/2010 for the course ECE 3710 taught by Professor Haris during the Spring '07 term at Georgia Institute of Technology.
 Spring '07
 Haris
 Volt

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