180 degrees out of phase
On Mon, 19 May 2014 23:49:14 +0100, Rheilly Phoull wrote:
On 20/05/14 03:19, Ian Field wrote:
wrote in message
news:alpine.BSF.2.00.1405181650420.37808@bunrab...
On Fri, 16 May 2014, Uncle Peter wrote:
But I wonder if it would help reduce the meter reading?
No. The coil and the capacitor add up (ideally) to zero impedence, so
it's like you put a wire accoss the mains. It burns and/or the
breaker/fuse opens. For real components the coil & cap still cancel
out and leave basically the resistance of the coil, which for a
``large'' coil is probably small, so again bad things happen.
But you have a basic fallacy anyway. At resonance the current is /in/
phase with the voltage, the capacitive and inductive reactance cancel
out so the circuit looks purely resistive.
If you like complex impedences (and adding a bit of series R &
using the EE jxj=-1 & w standing in for omega = 2 pi f)
XL=jwL
XC=1/jwC
Z=jwL+1/jwC+R
at resonance w=sqrt(1/LC)
Z=j( sqrt(1/LC)L-1/sqrt(1/LC)C )+R=j( sqrt(L/C)-sqrt(L/C) )+R=R
I=V/R
Peter did all that fancy math at uni, he can do the phase reversal in
his head - by attaching a pair of electrodes either side and passing the
whole meter current through it.
Hopefully he will?
Do they do that for fun at parties in Wales?
--
It hurt the way your tongue hurts after you accidentally staple it to the wall.
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