AC Source Tx and Thevenin

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Transcript AC Source Tx and Thevenin

Lesson 23
AC Source Tx
AC Thèvenin
Learning Objectives


Construct equivalent circuits by converting an AC
voltage source and a resistor to an AC current
source and a resistor.
Apply Nodal Analysis to an AC Circuit.
Review
DC Source transformation

Source transformation is the process of
replacing a voltage source vs in series with a
resistor R by a current source is in parallel with a
resistor R, or vice versa.
vs
vs  is R or is 
R
AC Source transformation

A voltage source with impedance Z in series is
the same as a current source with an
impedance Z in parallel.
Example Problem 1
Convert the voltage source to a current source:
Example Problem 2
Using source transformations, determine the voltage drop
VR across the 3 ohm resistor and the current IR through it.
Example Problem 3
Using source transformations, determine the voltage drop
Vab across the 10 ohm resistor.
Nodal Analysis

Example 17.12 in Text.