2007-10-30 20:29:40 · 3 answers · asked by guy17 2 in Science & Mathematics ➔ Physics
A capacitor of 1 farad is possible, and you can buy one. I saw once a 3.3 F capacitor in an electronics catalog. These have very low voltage ratings (3v or 5v), and are often used as temporary backup voltage sources for batteries so voltage is not lost when the battery is changed.
2007-10-30 20:42:49 · answer #1 · answered by gp4rts 7 · 2⤊ 0⤋
They are possible and have been manufactured for some years. However they are generally low voltage. the difficulty in making large value capacitors is in the equation for making them which involves A/d where A is the area of the capacitor and d the distance between the plates. Basically d cant be made that small and hold any sort of voltage. So you can see that high capacitance goes along with a large volume. I cant do the symbols on this computer for the other bits but it involves being multiplied by a small number the permittivity of free space and a dielectric constant for the material the capacitor is made out of.
2007-10-31 04:23:27 · answer #2 · answered by Robert G 1 · 1⤊ 0⤋
what made you think that they are not possible to be made?
2007-10-31 05:00:07 · answer #3 · answered by EeE 4 · 1⤊ 0⤋