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Joined: Jun 2005
Posts: 8
Z
zed Offline OP
Junior Member
Does anyone know why, when a reply is logged regarding my question, I am now not notified by email??

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Joined: Sep 2003
Posts: 650
W
Member
To maintain the energy stored in an inductor, you short circuit it. Since the energy is stored in the magnetic field, and this requires current flow, you want the current to flow unimpeded.

If you want some fun, imagine an electrical power distribution system based upon ideal constant current sources, rather than constant voltage sources.

-Jon

Joined: Jul 2002
Posts: 8,443
Likes: 3
Member
zed,
Quote
Does anyone know why, when a reply is logged regarding my question, I am now not notified by email??
Did you tick the box below the Original thread window that says "Email me Reply Notifications"?.
If you didn't, the notifications won't be sent to you.
This could be the reason. [Linked Image]
Cheers,
Mike. [Linked Image]

Joined: Mar 2005
Posts: 1,803
Member
A brilliantly cogent reply John! At last, after 50 years, I now understand why that little capacitor on the points of my old motorcycle's ignition distributor was so vital!
Alan


Wood work but can't!
Joined: Aug 2001
Posts: 7,520
P
Member
Have to add my 2 cents in commending John's excellent explanation. [Linked Image]

Just to add one very tiny point that the "d" above (as in dI/dT) is the Greek letter delta symbolizing "change." (Character sets can be a little restricting at times!)

Now, if somebody can tell me where to buy the resistance-less capacitor and coil, I can solve more than a couple of little problems..... [Linked Image]

Joined: May 2005
Posts: 178
J
Member
Jon, you've got it exactly right. Interesting point, too -- with a constant-current system, you'd connect all the homes, businesses, etc. in series instead of parallel, and each would develop a particular voltage drop according to its power usage. By the way, that's pretty much how I've been told that incandescent street lights used to work, with current-regulating pole pegs.

Thanks again to all for the kind words.

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