Working out internal resistance.

[Energize]

I have two different circuits and I need to work out the internal resistance of the cell.

So far I have got to 0.8(5+r)=1.2(2.5+r)

Where do I go from here?

 

[drpizza]

Assuming the equation you have is correct, it should be relatively simple to solve. I suppose the simplest way to get you started is to suggest using the distributive property on both sides of your equation in order to "clean it up."

 

[rsk]

he means multiply out yer brackets ;)