J
John Fields
Guest
On Thu, 12 May 2011 07:29:16 -0700 (PDT), George Herold
<gherold@teachspin.com> wrote:
Yeah.
That'll make a pretty nice arc in real life, huh?
Of course all the parasitics have been left out, but even adding them
in will still leave enough voltage for a nice arc, so "arc imitates
life."
--
JF
<gherold@teachspin.com> wrote:
---On May 12, 5:18 am, John Fields <jfie...@austininstruments.com> wrote:
On Wed, 11 May 2011 17:55:48 -0700 (PDT), George Herold
gher...@teachspin.com> wrote:
On May 11, 6:01 pm, John Fields <jfie...@austininstruments.com> wrote:
On Tue, 10 May 2011 19:42:22 -0700 (PDT), George Herold
gher...@teachspin.com> wrote:
On May 10, 8:00 pm, John Fields <jfie...@austininstruments.com> wrote:
On Tue, 10 May 2011 06:41:45 -0700 (PDT), BBC <ssundar.s...@gmail.com
wrote:
@rich:can u tell me how the reactance is responsible for phase
difference?
---
@BBC:
Here, I'll take crack at it:
When a voltage is applied across a conductor and charge starts to
flow, a magnetic field is generated around the conductor which causes
a voltage to be generated in the conductor which opposes the applied
voltage.
This opposition is in addition to the ohmic resistance of the
conductor, and is called "Inductive reactance" or, written
symbolically, "Xl" (X sub L)
Now, since time is nature's way of keeping everything from happening
all at once, the magnetic field doesn't build up instantaneously and,
as a consequence, as the voltage across the inductance varies, the
current through it won't fall in step.
Do you understand?
--
JF
You know, I think the best way to understand about R, C and L might be
to build circuits and measure things with 'scopes. (and the proper
scope probes) But I can't remember every doing that in college.
Instead of investing all that time and all those resources, why not
just use SPICE?
--
JF- Hide quoted text -
- Show quoted text -
Hmm, Yeah the difference between a simulation and real life. No arc's
when you unplug the coil at full current in the simulation.
George H.
---
Arc is???
Take a look at the top of the coil for a clue.
Version 4
SHEET 1 880 680
WIRE 208 208 96 208
WIRE 304 208 288 208
WIRE 416 208 384 208
WIRE 416 256 416 208
WIRE 96 272 96 208
WIRE 224 272 224 256
WIRE 96 384 96 352
WIRE 224 384 224 352
WIRE 224 384 96 384
WIRE 272 384 272 256
WIRE 272 384 224 384
WIRE 416 384 416 336
WIRE 416 384 272 384
WIRE 96 464 96 384
FLAG 96 464 0
SYMBOL voltage 96 256 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value 10
SYMBOL voltage 224 256 R0
WINDOW 0 -53 5 Left 0
WINDOW 3 -242 110 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V3
SYMATTR Value PULSE(0 1 1 1E-6 1E-6 10)
SYMBOL sw 304 208 M270
WINDOW 0 32 15 Left 0
WINDOW 3 32 44 Left 0
SYMATTR InstName S1
SYMBOL res 400 192 R90
WINDOW 0 -35 56 VBottom 0
WINDOW 3 -30 58 VTop 0
SYMATTR InstName R1
SYMATTR Value 1
SYMBOL ind 400 240 R0
SYMATTR InstName L1
SYMATTR Value 10
TEXT 104 408 Left 0 !.model SW SW(Ron=1 Roff=1e9 Vt=0.5Vh=0)
TEXT 102 440 Left 0 !.tran 20 startup
--
JF- Hide quoted text -
- Show quoted text -
Wow a giga volt spike! Is that what you want me to see?
George H.
Yeah.
That'll make a pretty nice arc in real life, huh?
Of course all the parasitics have been left out, but even adding them
in will still leave enough voltage for a nice arc, so "arc imitates
life."
--
JF