A car battery that has a terminal voltage of 12.6V for 75.0A, and 14.1V for 60.0A. What is the electromotive force and internal resistance of this car battery?
How can I find those two if they are in the same formula? There's no explanation in our resource and I can't find any similar problems online. It's already been 2 hours trying different things, please help...
the greater voltage drop at higher current is due to the internal resistance
let E equal electromotive force , and R equal internal resistance
E - 14.1 = 60.0 * R
E - 12.6 = 75.0 * R
subtracting equations (to eliminate E) ... 1.5 = 15.0 R
solve for R , then substitute back to find E