The discussion revolves around calculating the impedance of an RL circuit consisting of a resistor and an inductor connected in series with an AC source. The original poster seeks to understand how to incorporate capacitive reactance into the impedance formula, despite the circuit lacking a capacitor.
Participants are actively engaging with the concepts, questioning assumptions about the circuit's components and the application of formulas. Some guidance is offered regarding the use of phasor diagrams and Kirchhoff's voltage law, but no consensus on a final approach has been reached.
The original poster expresses confusion about the absence of a capacitive element in the circuit while attempting to apply a formula that includes capacitive reactance. This highlights a potential misunderstanding of the circuit's configuration and the relevant equations.
Your formula for Z applies to RLC circuits. You have an RL circuit. Do you know how that formula for Z was derived? It was probably using a phasor diagram. If you understand the derivation, it's pretty easy to see what you need to do.PeachBanana said:
Yes, it's Kirchoff's voltage law applied to the elements in series.PeachBanana said:
And because VL leads the current by 90°. The two phasors point in opposite directions, so when you add them vector-wise, you subtract their magnitudes.
