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.