a mate has noticed that the voltage in some capasitors goes up slowly after discharging. why is this? where is the power coming from?
and why isnt this power used in practical applications?
2007-05-28 17:00:13 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
cap is not part of a circit. it is standing on the desk by itself. also it consistantly charges at a steady pace after discharge, reguardless weather i mesure it once after 60 seconds or leave the multimeter attached perminantly during 60 seconds, so probably not coming from mesuring device.
no, i dont think its magical, but just because its unknown doesnt make it magical either.
2007-05-28 18:52:22 · update #1
Is it installed in something? If so you have a small short or something to for it to draw the electricity to charge it.
2007-05-28 17:04:41 · answer #1 · answered by sweetpea 2 · 0⤊ 1⤋
In the old days when we used Simpson 260 meters, the ohm circuit uses an internal battery to put current through the DUT. We would check the charge up rate of electrolytic caps as a measure of whether they were still capable of working.
2007-05-29 15:08:38 · answer #2 · answered by lare 7 · 0⤊ 0⤋
You may be charging the capacitor with the instrument you are using to measure the voltage. I suspect that is what is happening. Or, if the capacitor is connected in a circuit, then there is some leakage source that is charging it. Voltages don't just appear magically.
2007-05-29 00:33:08 · answer #3 · answered by Matt D 6 · 2⤊ 0⤋
Some large electrolitic capacitors can act as very weak batteries with very small voltage. You can measure this with a sensitive volt meter. This is usually very insignificant though. It's just their chemistry.
2007-05-29 01:29:52 · answer #4 · answered by kooseh 1 · 0⤊ 0⤋