I am tasked with finding the internal resistance and voltage of a battery. I am given the following:
A simple circuit consists of a real battery and a resistor in series. When the resistor's resistance is 35-Ohms, a voltmeter reads 9V. The resistor is then swapped out for one with a resistance of 14-Ohms and the voltmeter reads 8.1V
I'm not sure how I can use this information to find the internal resistance and voltage of the battery.
Since I have values for two situations and two unknowns I think I need to relate the values in such a way that I have two equations and can then solve for the needed values. I tried using the loop rule and some of the fundamental formulas for current/resistance etc. to set up a system of equations since that's the only method I've seen that seems potentially useful but it doesn't line up correctly.