Find w For AC RLC Circuit When Emf is In Phase With Current

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Homework Help Overview

The discussion revolves around an AC RLC circuit where the original poster seeks to determine the frequency (w) at which the electromotive force (emf) is in phase with the current. The circuit consists of an inductor in series with a parallel combination of a capacitor and a resistor.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to recall previous knowledge regarding phase relationships in RLC circuits and questions whether the relationship w = 1/√(LC) applies. Other participants inquire about the factors causing phase differences between current and voltage, and discuss the implications of reactance in the circuit.

Discussion Status

The discussion is ongoing, with participants exploring the concept of phase differences and the role of reactance in the circuit. Some guidance has been provided regarding the conditions for current and voltage to be in phase, but no consensus has been reached on the specific frequency or its calculation.

Contextual Notes

The original poster mentions being a transfer student and lacking prior exposure to phase concepts in RLC circuits, which may influence their understanding of the topic.

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Homework Statement



I have an AC RLC circuit with the inductor in series with parallel capacitor and resistor.

At what w is the emf in phase with the current?

Homework Equations





The Attempt at a Solution



I'm suppose to know this from a previous class but as a transfer student my classes never dealt with phase or RLC circuits. Any help would be phenomenal.

The question is specifically asking if ##w=\frac{1}{\sqrt{LC}}##
 
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What exactly within an electrical system causes the phase of the current to differ from the phase of the voltage?
 
The inductor resists changes in current so voltage changes happen more quickly and vice versa at the capacitor. (I just discovered ELI the ICE man). So, would this mean that the peak would happen every 90 degrees? How would I relate the angle to w?
 
The phase of the current will differ from the phase of the voltage if there is reactance present within the network. If the voltage and the current are completely in phase with one another, it implies that the load is completely resistive (imaginary portion of the impedance is zero). Do you know how to calculate the impedance of a capacitor and inductor?
 
I see you found my other post! I'll discuss this there.
 

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