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Old 08-11-2010, 01:52 PM   #1
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Capacitors


Hi, I just started tech school for electrician and I was wondering exactly what a capacitor is and does. thanks
Kyle Reed

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Old 08-11-2010, 02:01 PM   #2
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Capacitors


I think this link might help you...

http://tinyurl.com/2c88xws

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Old 08-11-2010, 02:12 PM   #3
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Capacitors


Quote:
Originally Posted by ReedELC101 View Post
Hi, I just started tech school for electrician and I was wondering exactly what a capacitor is and does. thanks
Kyle Reed
Where are you located?
What type of school did you join (associated with any program)?
What type of electrician do you want to be?

As for the capacitor, there is nothing I can tell you that would be better than the link above.
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Old 08-11-2010, 03:33 PM   #4
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Capacitors


The short answer is that capacitors are like batteries in that they store a charge.

Depending on the type of capacitor they could be used for varying reasons. Sometimes to store a charge like in a high power car audio application the capacitor will take up the "slack" when the battery can't provide enough power. Some smaller tantalum caps are used on DC power supplies to filter out high frequency noise.

They also act just the opposite as resistors because resistors in series add their value, and subtract total resistance in parallel, Capacitors subtract total capacitance in series and add capacitance in parallel.

First one I can answer!!! Woo Hoo!! An electronics degree pays off!
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Old 08-11-2010, 03:35 PM   #5
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Quote:
Originally Posted by Proby View Post
Where are you located?
What type of school did you join (associated with any program)?
What type of electrician do you want to be?

As for the capacitor, there is nothing I can tell you that would be better than the link above.

Doh!! I didn't see this or the previous, I just replied to the OP. Sorry.
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Old 08-11-2010, 06:36 PM   #6
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Capacitors


Extra credit question:
What happens if
you put a perfect short circuit across
an ideal capacitor
that is charged?
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Old 08-11-2010, 06:45 PM   #7
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Capacitors


Quote:
Originally Posted by Yoyizit View Post
Extra credit question:
What happens if
you put a perfect short circuit across
an ideal capacitor
that is charged?
The Earth collapses into itself.
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Old 08-11-2010, 06:56 PM   #8
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Capacitors


My electronics teacher in HS had a some sort of military capacitor the size of a 5 gal. metal gas can.
In class he charged it up and shorted it out with about a 2” thick phone book in between. WOW, a grapefruit size hole in the book and ears were ringing.
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Old 08-11-2010, 07:03 PM   #9
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Capacitors


Quote:
Originally Posted by Yoyizit View Post
Extra credit question:
What happens if
you put a perfect short circuit across
an ideal capacitor
that is charged?
If you use a flux cable, you create a flux capacitor. Only works with 3 way capacitors. These normally only work with extremely high voltages such as lightning. You can also buy Mr. Fusion home energy generators to produce the required power.

Once powered and interfaced with a time circuit, you can travel through time with it.

Last edited by Red Squirrel; 08-11-2010 at 07:10 PM.
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Old 08-11-2010, 07:31 PM   #10
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If you use a flux cable, you create a flux capacitor. Only works with 3 way capacitors. These normally only work with extremely high voltages such as lightning. You can also buy Mr. Fusion home energy generators to produce the required power.

Once powered and interfaced with a time circuit, you can travel through time with it.
Isnít there a car that runs on that power?
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Old 08-11-2010, 07:56 PM   #11
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Quote:
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Isnít there a car that runs on that power?
Yep, the Delorean.

Actually, I badly want one of those cars one day. Would be so fun to drive that around.
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Old 08-12-2010, 10:53 AM   #12
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Quote:
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The Earth collapses into itself.
Already tried it in northern NJ.
It didn't work.
But there was a sinkhole in Passaic, I think.

Wishing people dead works slightly better.
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Old 08-12-2010, 12:51 PM   #13
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Capacitors


Quote:
Originally Posted by Yoyizit View Post
Already tried it in northern NJ.
It didn't work.
But there was a sinkhole in Passaic, I think.

Wishing people dead works slightly better.
Thought that was more out towards Ringwood or Wayne, where the old Ford Paint landfill was.
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Old 08-13-2010, 04:09 PM   #14
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Capacitors


What happens if you take an old vacuum tube radio, and decide to strip insulation off a wire to tube filter capaciters, with your teeth ?

Answer:
-You really learn about capacitors. ( you also learn how to fly )
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Old 08-13-2010, 04:13 PM   #15
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Quote:
Originally Posted by TJ_in_IL View Post
Thought that was more out towards Ringwood or Wayne, where the old Ford Paint landfill was.
http://www.epa.gov/region2/superfund...ood/index.html
and here I thought that NJ, and its residents, were as pure as New York snow.

The answer, Mr. Reed, is that infinite current flows for zero time and the energy stored in the cap is dissipated in this zero time interval as a burst of radio frequency energy at all frequencies.

BTW, 'infinity' times 'zero' is 'indeterminate'.


Last edited by Yoyizit; 08-13-2010 at 04:21 PM.
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