(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A battery of emf [insert symbol for emf here] and internal resistance is hooked up to a variable "load" resistance R. If you want to deliever the maximum possible power to the load, what resistance should you choose?(You can't change the emf and r, of course).

2. Relevant equations

P=I^2*R=V^2/R

Possibly V=[insert symbol for emf here]-Ir

3. The attempt at a solution

I think what I should do is differentiate the Power with respect to the variable load R and sint dP/dR =0

P=V^2/R=([insert symbol for emf here]-Ir)^2/R

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# Finding the maximum power delivered from a baterry

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