(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I was able to find the solution to this problem but I don't understand where it comes from.

A series RL circuit is connect to a 110-V ac source. If the voltage across the resistor is 85 V, find voltage across inductor.

2. Relevant equations

Not sure.

3. The attempt at a solution

Solution is given as

V_s^2 = V_r^2 + V_l^2

then solve for V_l, I don't understand were that equation comes from or how it applies here. We are currently starting to learn how to solve circuits with the phasor method.

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# Homework Help: Electrical Engineering- Simple AC circuit problem

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