# Phasor Analysis

1. Nov 13, 2016

### CoolDude420

1. The problem statement, all variables and given/known data
steady-state current through the loop will be of the form Bsin(1000t +b). What is the phase angle 'b'? in rads

2. Relevant equations

3. The attempt at a solution

I have no idea what I did wrong.

I first converted everything into the phasor domain. Then I used voltage division to get the voltage drop across the resistor. Then I used Ohms Law to get the current through the resistor which is the same as the current through the circuit.

2. Nov 13, 2016

### Staff: Mentor

Check your calculation for the impedance of the inductor. The formula for the impedance of an inductor is not he same as that of a capacitor.

Don't be afraid to promote j's in the denominator to the numerator. If you have a value like $1/0.25j$, then this can become $-4j$.

You don't need to do any voltage division here. Simply sum up the impedances to find the total impedance. Then apply Ohm's law directly: $I = E/Z$ (where E is the applied potential difference across Z).

3. Nov 13, 2016

### CoolDude420

Ah.
Finally got it. Thank you soo much.
It says in my lecture notes that inductors can be described be V = jwLI or I = 1/jwL * V
It says nothing else. How do I know like what to use when? I mean say im converting a 2H inductance into the phasor form, how do I know what to use?

4. Nov 13, 2016

### Staff: Mentor

$Z_L = j \omega L$

$Z_C = \frac{1}{j \omega C}$