# Homework Help: What is the output voltage in this circuit?

1. Feb 13, 2012

### dexterdev

I would like to know the output voltage in this circuit at label A. (I am a beginner , sorry for stupid questions if any? )

The circuit setup is a sine wave source (ideal) in parallel with DC source series with a resistor.

-Devanand T

2. Feb 13, 2012

### reddvoid

point A is at other end of AC source V
so voltage at A is V itself ...

3. Feb 13, 2012

### dexterdev

what about dc source plus resistor

4. Feb 13, 2012

### jrive

It is all dependent on the source impedance of the voltage source V. The way it is drawn, Rsource (Zsource) =0, so point A will be at V volts (it will follow the sinusoid) since it is a direct short.

if there were an R in between the source and node A, then you could determine the voltage there by using superposition and treating each voltage source separately (making the other voltage source 0) and using the voltage divider rule. The resulting value of A is the sum of the contributions from each source.

Last edited: Feb 13, 2012
5. Feb 13, 2012

### dexterdev

Thankyou all for the replies

6. Feb 13, 2012

### reddvoid

it doesn't matter .