AC in a DC circuit

[fran1942]

Hello, an elementary question here.
I am thinking about a BJT transistor amplifier circuit which has the usual AC coupling capacitors to allow the AC signal to pass while isolating the DC component.
I understand that but my question is how is this decoupled AC signal represented on the actual wire ?
Is it represented as current alternately moving forward and reverse?

Thanks for help with my understanding of this.

[Bassalisk]

Hello, an elementary question here.
I am thinking about a BJT transistor amplifier circuit which has the usual AC coupling capacitors to allow the AC signal to pass while isolating the DC component.
I understand that but my question is how is this decoupled AC signal represented on the actual wire ?
Is it represented as current alternately moving forward and reverse?

Thanks for help with my understanding of this.

What do you mean by forward and reverse? You mean changing the direction of AC?

How is that represented physically?

Capacitor filters the DC component out, because DC current cannot pass through capacitor.