Question on internal resistance.

[renzbagaporo]

I recently encountered circuits with the source having internal resistance, and it became confusing applying Kirchoff's Rules.

What I did is this:

assuming the loop is counter clockwise: -------wire - negative terminal +positive terminal
(conventional flow)


when:
---------- - + ----------------,
I put : +(E- Ir) + (other IR's)

when:
---------- + - ----------------,
I put : -(E- Ir) + (other IR's)

Is what I did correct? Also, can I treat the internal resistance as an external resistance?

 

[berkeman]

I recently encountered circuits with the source having internal resistance, and it became confusing applying Kirchoff's Rules.

What I did is this:

assuming the loop is counter clockwise: -------wire - negative terminal +positive terminal
(conventional flow)


when:
---------- - + ----------------,
I put : +(E- Ir) + (other IR's)

when:
---------- + - ----------------,
I put : -(E- Ir) + (other IR's)

Is what I did correct? Also, can I treat the internal resistance as an external resistance?

Welcome to the PF.

Unfortunately, the way that you posted your question is very confusing. I will move your thread to the EE forum, and I would like to please ask you to attach an image file of what you are asking.

Source resistance is normally just shown/modeled as a series resistor connected to an ideal voltage source. Nothing more. Please post an attached image of what you are asking. Thank you.

 

[Abstr7ct]

Adding to berkeman's post:

That's how you do it.