2007-09-20 05:55:33 · 3 answers · asked by Roshni 2 in Science & Mathematics ➔ Engineering
It is resistance to flow of alternating current, but since alternating current has 2 dimensions (amplitude in Amps and frequency in Hertz), impedance must have 2 dimensions also: Resistance as a function of frequency and phase of that resistance as a function of frequency.
At zero frequency (direct current, or DC), impedance becomes simple resistance.
Ohms law still applies for ac circuits: V(t) = I(t) * Z(t)
V and I are functions of time
Z is the impedance as a function of time.
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2007-09-20 06:07:27 · answer #1 · answered by tlbs101 7 · 2⤊ 0⤋
Its used in ac applications the same way resistance is used in dc and ac.
2007-09-23 05:53:33 · answer #2 · answered by Poor one 6 · 0⤊ 0⤋
A varying load of resistance to an inputted signal! ;-)=
2007-09-20 06:03:22 · answer #3 · answered by Jcontrols 6 · 0⤊ 1⤋