Internal resistance of a battery cell

  • Thread starter Cici2017
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  • #1
Cici2017
if a cell is running down, there would be a constant drop in p.d. across the cell, does the internal resistance of the cell increase or decrease?
 

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  • #2
CWatters
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There are lots of ways to model a battery cell. One way is with a constant or variable EMF and a variable internal resistance that increases as the cell discharges. That's not a bad model for alkaline cells.

However different types of cell (eg different chemistry) need different models. There isn't a one model that fits the behaviour of all cells.
 
  • #3
Shaon Debnath
Emf of a cell is the potential difference between it's terminals when terminals are connected externally.
∆V=E - I*r
E=emf
I=current
r=internal resistance
 

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