Working out internal resistance.

AI Thread Summary
To determine the internal resistance of a cell using the equation 0.8(5+r)=1.2(2.5+r), the next step involves applying the distributive property to simplify both sides. This process will help eliminate the brackets and make the equation easier to solve. After simplifying, isolate the variable r to find the internal resistance. The discussion emphasizes the importance of correctly manipulating the equation to reach a solution. Solving for r will provide the internal resistance of the cell in the given circuits.
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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?
 
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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."
 
he means multiply out yer brackets ;)
 
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