(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

There is a circuit with an alternating voltage source and a capacitor (capacitance C) an inductor (inductance L) and a resistor (resistance R). The resistor has a potential VR marked across it.

Calculate the magnitude and phase of the voltage VR.

2. Relevant equations

Impedance of resistor=R, impedance of capacitor=-j/wC, impedance of inductor=jwL, impendances in series add linearly.

3. The attempt at a solution

My first though was just to treat it as a potential divider and its easy to find the magnitude. But I'm getting at bit confused about finding the phase of VR: can you just take the phase from the potential divider equation, so pahse relative to input voltage=-arctan((wL-1/wC)/R)? Possibly it's me trying to make things harder than they should be but it's from a past exam paper and was worth 12 marks so doesn't seem to involve much work?

Thanks

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Help with Impedances

**Physics Forums | Science Articles, Homework Help, Discussion**