[*Neon23]

I'm currently studying about transistors and I would like some guidance on this part
where an amplifier has this kind of circuit





For the DC Equivalent Circuit
The potentiometer would be a fixed resistor and the capacitor would be open and would result to a circuit of





On an AC Equivalent Circuit

the capacitor would be shorted. However I can't seem to understand how would the potentiometer act on this circuit

 

[Harald Kapp]

You need to replace the potentiometer by two resistors that add up to the value of the potentiometer. Using a single resistor represents only the special case with the wiper in the top position.