## finding AC voltage across Resistor

1. The problem statement, all variables and given/known data

I have three questions
1. How do you find AC voltage across resistor when there are both AC and DC current?
2. is AC voltage across a resistor different from voltage across a resistor?
3. Find AC voltage across Resistor (in this image)
http://img199.imageshack.us/i/acv.gif/
load line Eq: V(ec)=12-6000*I(c)

2. Relevant equations
Voltage across resistor = I*R
but I do not know if this can be used when there are mixture of

3. The attempt at a solution
well I tried making a AC current by removing battery out of the circuit. I would still get around 3 volts. Also tried using V(max) and V(min) and calculated for I*R(l), but got around 6 volts (which is way off)
now I'm out of ideas. (well I do not understand the problem fully in the first place)
Do I need to use the chart on the bottom?

by the way, does this topic (or anything under circuits, electric fields, and optics-related physics) belong to advanced physics? or is this in the right section?)
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 can I simply find I(c) max and I(c) min and find both voltage of V(ec) then find the difference divided by 2?

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