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Well, someone can correct me if I am wrong, but it sounds like you are reading a misspelling of the word "impedence" I personally have never heard the word impadence.
If that is the case, and if you don't already know what impedence is, it is the combined values of resistance and reactance in any combination of RLC circuit. (resistors,inductors, and or capacitors) This value, like resistance, is given an ohmic value. Reactance being devided among inductive reactance(XL) and capacitive reactance (XC).
Reactance occurs in AC circuits, so generally speaking, impedence is used to describe the opposition to current flow in AC circuits, where resistance is used to describe purely resistive circuits having no coils or capacitors. inductive reactance is found by multiplying: XL= 2 x pi x the frequency of the AC x the coil value in Henries. Capacitive reactance is found by dividing: XC=1 divided by (2 x pi x frequency x capacitance in Farads)
These values all combine and contribute to the impedence of the circuit (Z) which is expressed in Ohms.
In short, impedence is a generalized form of resistance (You do know resistance, right?).
While you can find the equivalent resistance of a network of resistors, you can similarly find the equivalent impedance of a network of resistors, capacitors and inductors, and apply the same Ohm's Law Z=V/I. You can find the time-domain response by finding the inverse laplace transform. You can also find the spectrum of the network, ie if it's a low-pass filter or high-pass.
Actually, the definition of impedence is simply Z=V/I.
You are right. It seems that I've been mispelling it all the time. Thanks!
Also, from google searches, it seems that I'm far from being alone too. :lol:
Typically we model capacitors with a capacitor and an resistor in parallel to show that their are leakage currents present. Now typically that "resistor" is measured in semens or mohs whichever you prefer because thats the way the math works out.
Those conductances are usually vary small (which makes the resistances very large), so they are typically never something you think about unless you're working at RF frequencies because everything becomes important at those frequencies.
Typically we model capacitors with a capacitor and an resistor in parallel to show that their are leakage currents present. Now typically that "resistor" is measured in semens or mohs whichever you prefer because thats the way the math works out.
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