In this equation I r= E-V/V*R
How would I find R? thanks in advance you your help.
What do you mean? Are you asking about how to do the algebraic manipulations? And where are the parens in your equation?
Oops. r= (E-V/v)*R
This equation shows that knowing the emf E, the voltmeter's reading of the terminal voltatge V, and the resistance of the voltmeter R, the unknown internal resistance r of the battery can be computed.
I'm trying to find r. I know E,AND V. But I don't know how to find R.
Separate names with a comma.