1. The problem statement, all variables and given/known data A voltmeter is connected across a cell in a circuit containing a switch and a 2Ohm resistor. When the switch is open, the voltmeter reads 12V. When it is closed, the reading is 8V. Find the internal resistance of the cell. 2. Relevant equations I tried to use V=IR - is I constant? does this have to do with voltage drops? 3. The attempt at a solution the solution is 1Ohm. Why is that?