Help with EE homework...

[JohnCU]

The question states: The frequency of the source voltage in the circuit is adjusted until i is in phase with v. What is the value of w in radians per second?

The circuit is a voltage source, then a 500 ohm resistor and 1 uF cap in series, followed by a .5H inductor and 1000 ohm resistor in parallel. The equivalent impedance is 500.0025 + j(5w-1000000)... what do I do to solve for w? I don't know anything about i or v except that they are in phase.

Pic of circuit: here

 

[Legendary]

I think a drawing of the circuit would help you get more responses.

 

[JohnCU]

wait, wouldn't it be the frequency that made the circuit purely resistive, cancelling out the j term? So solve 5w - 1000000 = 0?

 

[slpaulson]

Originally posted by: JohnCU
wait, wouldn't it be the frequency that made the circuit purely resistive, cancelling out the j term? So solve 5w - 1000000 = 0?

Sounds right to me.

 

[Stojakapimp]

i'm just throwing a bone out there, but would it have anything to do with calculating the phase of the system? I mean, you know the transfer function, right? Then can you just calculate the phase which is tan-1(imaginary/real)? Not sure if that would get you anywhere, but I have no clue what you are learning in your classes right now

 

[RaynorWolfcastle]

Easy problem, find the frequency at which the impedance is purely real

edit: I guess it was covered above, yes that is the right way to do it.