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
a = 0.50 A
v = 120
r1 = 50 ohm
r2 = ?
R = R1 + R2 + R3 + ...
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?