# Input and Output Resistance (Electronics)

by Midas_Touch
Tags: electronics, input, output, resistance
 P: n/a R_out |-------------***------------o------------------| |.........................................+........................| |.................................V_signal.......................* R_in -..V_out, perfect.............................................* -...................................................................| |...................................................................| |.........................................-.........................| |-----------------------------o------------------| =.......(ground)................................................= Say that circuit 1 is the left side of the above circuit (ignore the dots), and circuit 2 is the right side (R_in). First I have to find V_signal using kirchoff rules so I get V_signal -R_out - V_out, perfect - R_n = 0 But I am not sure what happens with R_in >> R_out, R_in << R_out or when R_in = R_out.
Emeritus
PF Gold
P: 5,532
I can't make heads or tails of your equation.

 V_signal -R_out - V_out, perfect - R_n = 0
Do you mean this?

$$V_{signal}-R_{out}-V_{out,perfect}-R_n=0$$

That's what it looks like, but if that is in fact the equation that it makes no sense. You're subtracting voltages and resistances, which have totally different units.

 Related Discussions Electrical Engineering 24 Engineering, Comp Sci, & Technology Homework 14 Electrical Engineering 2 Electrical Engineering 6 General Engineering 9