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Big Capacitors

I found a big capacitor in a floor cleaner...I think. It is a black cylinder with two leads off the end. In the floor cleaner, it was hooked up to a lot of stuff in a really important looking box that had a lot of wires flying everywhere. It looks sort of like the thing below, but a little smaller. So, really, there are two questions:
1. Is it a capacitor?
2. If it is, what can I do with it?
Thank you!


Picture of Big Capacitors
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Goodhart4 years ago
Some Info on start / run motor caps:

An esxample:  a high rated capacitor may be used to start a particularly large electric moter (once electricity is supplied to both mothor and cap).  That "punch" gets it to move, OR to adjust a motor as it runs.
basementhacker (author)  Goodhart4 years ago
But that motor is run on batteries or AC power right?
That's the point. It is another "use" for capacitors.
Goodhart4 years ago
Are any of the specs on the side similar to this?

220 uF

 or:   1 F

(the number can be different than what I have listed, but the micro farad and farad rating should be on the side).


Like this.... 
Large_can_capacitor.jpg
basementhacker (author)  Goodhart4 years ago
What would be considered a "big" capacitor? I'm going for 2 12V capacitors to run a 24V engine.
IF you mean big in potential, than the one or two farad super capacitors are the biggest. IF you mean in size....I have seen them as large as a 5 gallon bucket already but not much in the way of capacity.
basementhacker (author)  Goodhart4 years ago
I meant big in potential/power carrying-ness. A 5-gallon bucket strapped to a bike probably isn't going anywhere. :)
The "smaller" they are however, the less voltage they can handle, many times.
basementhacker (author)  Goodhart4 years ago
OK. So get big (er) ones and wire them in series?
That is only voltage TO them. I have a one farad and a two farad capacitor that are about as big around as a quarter, and close to as thick as my finger. You would not want to discharge it across you hand :-) . Another note: you are aware that, when you put resistors in series, the resistance "adds up", but when you put them in parallel, things get complicated.

The same thing, in reverse, happens with capacitors.  In parallel, you add the capacitance up, but in series; figuring the capacitance becomes "complicated".
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