1. The problem statement, all variables and given/known data a 50 ohm resistor, an unknown resistor R, a 120 volt source and an ammeter are connected in a compelete circuit. the ammeter reads 0.50 ampere 1)calculate the equivalent resistance of the circuit 2)determine the resistance of resistor r 2. Relevant equations a = 0.50 A v = 120 r1 = 50 ohm r2 = ? R = R1 + R2 + R3 + ... 3. The attempt at a solution the problem is a series circuit so how do i know the other resistance if i know the first one?