# Basic Phasors

1. Feb 25, 2017

### CoolDude420

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

I'm revisiting phasors again. This is one of the topics I've always struggled with. Every time I do a new module, they change a lot of the convention. I've been using Schaums outline of electric circuits recently to get refreshed. I'm just confused on this one part:

2. Relevant equations

3. The attempt at a solution

My question is with the w that appears in the forumla for VL. I understand that the current was differentiated to -sin and I understand that L is the inductance from the inductor voltage equation and that I is the amplitude from the current, but where is the w(omega, frequency) coming from at the front?

2. Feb 25, 2017

### blue_leaf77

Do you know what the first derivative is of $\cos(ax)$ with respect to $x$ with $a$ being a constant?

3. Feb 25, 2017

### CoolDude420

-asin(ax). I see now. Quite stupid of me. Guess I just got confused when we're using actual AC signals and not x. Cheers