Complex Notation - Electrical Circuit


by amy1983
Tags: circuit, complex, electrical, notation
amy1983
amy1983 is offline
#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  
Phys.Org News Partner Science news on Phys.org
SensaBubble: It's a bubble, but not as we know it (w/ video)
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Microbes provide insights into evolution of human language
gneill
gneill is online now
#2
May7-12, 07:41 PM
Mentor
P: 11,446
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
amy1983 is offline
#3
May9-12, 03:33 AM
P: 7
Thank you gneill, i'll have to look at it and perhaps get a physics tutor.


Register to reply

Related Discussions
LRC Circuit with odd notation Introductory Physics Homework 2
Electrical/Electrical books for circuit/network theory Science & Math Textbook Listings 3
complex notation Calculus & Beyond Homework 3
Electrical Circuit/Electrical Power Problem Introductory Physics Homework 2
J-Notation (Complex Numbers) Electrical Engineering 4