# RLC parallel circuit question

Discussion in 'Homework Help' started by hotrocks, Feb 15, 2011.

1. ### hotrocks Thread Starter New Member

Jun 29, 2010
8
0
hi all,

I have an RLC parallel circuit with a capacitor in parallel with a resistor / inductor in series ( representing a coil ). There is a 1v peak AC supply and I need to calculate the voltages, currents, angles etc and draw the resultant phasor.

When calculating the current in the resistor / inductor branch do I use the 1v peak supply stated or convert to rms (*0.707) first of all.

Irl = 1 / z or Irl = 0.707 / z

The same applies to the capacitor current

Ic = 1 / Xc or Ic = 0.707 / Xc

As stated I need these values to be correct to draw the resultant phasor diagram

2. ### hotrocks Thread Starter New Member

Jun 29, 2010
8
0
Maybe I didnt explain very well I attach a quick sketch of the circuit.
I wish to know if the calculations and resultant phasor should be drawn using the peak supply voltage or the rms supply voltage.

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3. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
783
Probably doesn't really matter if you draw the phasors in peak or rms as long as you are consistent - using either one or the other - not a 'mixture'.

Convention normally assumes one is using rms values.