Circuit Analysis: Solving Homework Problems in EE

[ryujio85]

Homework Statement

OK well I have this as a small piece of assessment and I am really bad at electrical engineering civil is my major heh.

http://img161.imageshack.us/img161/2461/image1uw1.jpg


1. Find the voltages at A and B (with respect to reference node G) using mesh analysis,
2. Replace subcircuits G-A, A-B, and B-G by their Thevenin equivalents. Hence
find the voltages at A and B (with respect to G), the power dissipated in each
resistor in the original circuit, and the power supplied by each source.
Hint: the power supplied by the current source is about -1.8 watts.
3. Find the voltages at A and B (with respect to G) by using the superposition of
the effects of the three sources.

Homework Equations

KVL, KCL, Mesh analysis, nodal analysis, superposition, thevenin equivelants

The Attempt at a Solution

part 1 - I figured that I have to use mesh analysis to find I1, I2 and I3 and then apply the brach currents in R2 and R4 I used mesh analysis and got values for i1/i2 and i3 but don't really know exactly what to do from there
part 2/3 - I am totally lost

I realize this is a pretty poor start but electrical engineering is not something I've ever dealt with Any help/guidance is much appreciated if someone wated to give me some really specific advice my email is ryujio85@tpg.com.au and my msn is ryanmarshall_85@hotmail.com Id reimburse you for your time if you helped me out at a normal tutor rate.

 

[Astronuc]

One's textbook should cover the application of Thevinin's theorem.

See if this helps - http://www.allaboutcircuits.com/vol_1/chpt_10/8.html


Also - http://www.allaboutcircuits.com/vol_1/chpt_6/index.html


The power dissipated in a resistor is simply the product of the voltage drop, V_R across that resistor and the current through the resistor, which is also V_R²/R or alternatively I²R.