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Complex Notation - Electrical Circuit

by amy1983
Tags: circuit, complex, electrical, notation
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amy1983
#1
May7-12, 04:05 PM
P: 7
1. The problem statement, all variables and given/known data

1 (a) using complex notation, find an expression for the output voltage, v0
1 (b) using complex notation, find an expression for the input current, ig, and hence determine the phase angle of ig relative to vg


2. Relevant equations



3. The attempt at a solution
See attached two attempts, in jpgs. I've gotten myself very confused!! If someone could advise that would be great.
Attached Thumbnails
Possible Solution 1.jpg   Possible Solution 2.jpg  
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gneill
#2
May7-12, 07:41 PM
Mentor
P: 11,689
1.2 mH is not the same as 0.001 H; you've dropped a significant figure. This in turn has significantly altered your impedance value for the inductor, with the error propagating through your further calculations.

The input is specified as a voltage source, and you've treated it as a current. This is not correct.

You've then assumed that both the resistor and the inductor are conducting the entire "current" of 40A. They are in parallel so this is not possible; Parallel branches have the same potential difference, but not necessarily the same current. It's series components that have the same current.
amy1983
#3
May9-12, 03:33 AM
P: 7
Thank you gneill, i'll have to look at it and perhaps get a physics tutor.


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