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(ELEC101)T07Example.pdf
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Example 1: (From P5-7, Circuits, Devices and Systems by Smith and Dorf)
Given the circuit of Fig. 1, determine the impedance presented to:
(a)
A direct current i = I = 20mA


(b)
A sinusoidal current

i =





Answers:













(a)
For DC, frequency = 0 = 0. =



The circuit under DC becomes

So,






(b)
i = = 5000 s = 5000 j













Fig. 1






Example 2: (From P4.30, Introduction to Electrical Engineering by Irwin)

Use nodal analysis to find Io in Fig. 2









Answers:

We know that V2 = 1290o V

Apply KCL at node V1





Io =


Fig. 2


Example 3: (From P4.33, Introduction to Electrical Engineering by Irwin)

Find IL in Fig. 3 using mesh analysis

Answers:

Apply KVL at Loop 1








Apply KVL at Loop 2































Fig. 3

1

2














Example 4: (From P4.46, Introduction to Electrical Engineering by Irwin)

Find Vo using Source Transformation




Answers: