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## Homework Statement

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

## Homework Equations

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?