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Hi gus,
I have an ISA to do tomorrow on internal resistance, but I almost get stuck on internal resistance, I can't get my head around it.

Let's say I have a battery with emf of 4.5v.

(emf = IR + Ir)

It's connected in series to a 12ohm resistor which reads 3v.

How do I figure out the current and the value of r?
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