Hi, Im in yr 11 and i study physics im my free time but have stumnbled across the following question that i cant seem to find an answer for in any books, would someone please be able to help me? A cell is connected in series with a variable resistor. A high resistance voltmeter is connected across the terminals of the cell. When the variable resistor is set at 13Ohms the voltmeter reads 1.30V. And when the Variable resistor reads 8Ohms the voltmeter reads 1.20V. Find: A) The emf of the cell B) The internal resistance of the cell. Any help at all would be greatly appreciated Thanks.