i just took apart a capasitor and theres a few meters of metal sheet, what is it?

i just took apart a 250microfarad capasitor i got out of a old tv, and when i opened it up, there was a long coiled sheet of metal sheet, and i would like to ask, what is this metal comprised of? wikipedia has been no help, nor has google

whoever answers this will get  a best answer from me

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Its aluminium foil. Its an aluminium electrolytic capacitor./
. Do they use separate sheets of Aluminum (geez, why can't you Brits learn to spell heehee) or aluminized Mylar? Enquiring minds want to know.
No, its rolled up from two sheets, with an electrolyte soaked spacer. Wires are welded on the ends, and its canned. Anodising takes place during manufacture, to create the dielectric

oldmanbeefjerky (author) 7 years ago
thanks steve, as the first answer to answer my question, you get best answer
You're using the same Wikipedia I'm using, right?


"Aluminum electrolytic capacitors are constructed from two conducting aluminum foils, one of which is coated with an insulating oxide layer, and a paper spacer soaked in electrolyte. The foil insulated by the oxide layer is the anode while the liquid electrolyte and the second foil acts as the cathode. This stack is then rolled up, fitted with pin connectors and placed in a cylindrical aluminum casing. The two most popular geometries are axial leads coming from the center of each circular face of the cylinder, or two radial leads or lugs on one of the circular faces. Both of these are shown in the picture."

Kiteman7 years ago
Dried up electricity.

Don't waste it, use it: shred the sheet, stir it into a beaker of water, and then drop in an LED.
Capacitors work on an electrostatic principle. basically, the area of these sheets and their spacing it what gives it it's rating in Micro farads. The larger the area and the closer they are, the higher the rating. The sheets are actually 4: 2 conductive, 2 insulative. They are alternatively stacked, and rolled up to stop them from contacting one another and themselves. Each conductive sheet is connected to one of the capacitors leads.
Aluminum foil.