2007-03-28 02:29:04 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
Capacitors have very low resistance. But it was a large impedance, specially is low frequency.
Hope this was helpful.
2007-03-28 02:38:36 · answer #1 · answered by rhapsody 4 · 0⤊ 0⤋
Yes and not!
Every capacitor has a tiny resistance except those made up of super-conductive material. But this resistance is negligible. This way we can say they are unresistant.
So capacitors don't have resistance but they can play the role of a resistor anyway. As a capacitor joins a simple circuit, it begins getting charged and as the charge saved on it increases, the current of the circuit reduces, so after a while that the capacitor is charged, the amount of current becomes zero. So we can say that it acts like a variable resistor (Reosta) with amount sliding from 0 to â .
I think this is what you were looking for.
2007-03-28 10:49:06 · answer #2 · answered by Fardin 2 · 0⤊ 0⤋
Yes all capacitors have resistance because of wire and dielectric losses. As an ac signal is applied to the capacitor, the polarization on the dielectric causes it to move a bit and generate heat. It can be significant. The resistance is called the ESR which stands for equivalent series resistance. Some electrolytics have such a high ESR that they no longer work as capacitors at a few MHz but look like resistors while silver mica caps are good to many many MHz.
2007-03-28 09:44:11 · answer #3 · answered by Gene 7 · 0⤊ 0⤋
Strictly speaking, resistance is the real part of impedance. A capacitor has a zero real part to its impedance at all frequencies, so it has no resistance. The imaginary part to its impedance depends on frequency.
By contrast an inductor has both real and imaginary parts to its impedance.
2007-03-28 09:35:21 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Yes, but not much.
Anything that current passes through has to have resistance.... Remember Ohm's Law. Put in zero for R and see what happens.
2007-03-28 09:33:32 · answer #5 · answered by Ilya S 3 · 0⤊ 0⤋
In case of capacitors we call it capacitive reactance(Xc) rather than resistance. Xc=1/2*pi*f*C
2007-03-28 10:30:53 · answer #6 · answered by anuj k 1 · 0⤊ 0⤋
Does it matter?
Check on the uses in a circuit of a cap.
The flow is frequency dependent. The ramp and decline functions incorporate it's affect.
2007-03-28 09:36:49 · answer #7 · answered by Wonka 5 · 0⤊ 0⤋
very small amount, as in not enough to really harm your circuit. Depending on manufacturing quality, it may have slightly more or less than usual
2007-03-28 09:44:28 · answer #8 · answered by andrewxa9 2 · 0⤊ 0⤋
YES
2007-03-28 09:32:58 · answer #9 · answered by Dr Universe 7 · 0⤊ 0⤋