# RL circuit with AC generator

1. Mar 14, 2010

### nns91

1. The problem statement, all variables and given/known data

A resistance R and a 1.4 H inductance are in series across a 60 Hz AC voltage. The voltage across the resistor is 30V and the voltage across the inductor is 40V.
(a). What is the resistance R ?
(b). What is the AC input voltage ?

2. Relevant equations

$$\xi$$=I*Z

3. The attempt at a solution

(a).So far I have I=$$\xi$$/ $$\sqrt{}R^2+X^2$$

How do I proceed from here ? Do I use I= $$\xi$$/ $$\omega$$L to find the current then substitute back to the first equation to solve for R ?

(b). I calculated V=$$\sqrt{}40^2+30^2$$=50 V. Is this correct ?

2. Mar 14, 2010

### nns91

I mean X(L)^2 not XL^2