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<blockquote data-quote="nineballsafety8" data-source="post: 3663153" data-attributes="member: 583462">i just ran across a post from october where someone asked how to measure impedence rise... well some of the replies... were factual but misleading.&nbsp; i just wanted to put out the closest answer i could give. so&nbsp; i thought i would share it with you all.v/a=r is a valid representation of Ohm&#039;s law... HOWEVER. r does Not equal impedance... it equals resistance... resistance is not the same as impedance...Z = Impedance (ohm)R = Resistance (ohm)XL = Inductance Reactance(ohm)where Z=the square root of (R^2+XL^2)The total impedance is not simply the algebraic sum of resistance and inductive reactance. Since the inductive reactance is 90 degrees out of phase with the resistance and, therefore, their maximum values occur at different times, vector addition must be used to calculate impedance.and to calculate inductive reactance you need to know the inductive force of the driver in Henry&#039;s and the frequency at which you are trying to measurethen you use the formula XL=2(pi)fLwhere XL= Inductive Reactance (ohm)pi=exact number, which is about 3.1416 (constant)f=frequencyL= inductance in Henry&#039;sso in answer to the OP&#039;s question... unless you have a program that will calculate it for you... u might want to let the big dogs handle it.</blockquote>

[QUOTE="nineballsafety8, post: 3663153, member: 583462"] i just ran across a post from october where someone asked how to measure impedence rise... well some of the replies... were factual but misleading. i just wanted to put out the closest answer i could give. so i thought i would share it with you all. v/a=r is a valid representation of Ohm's law... HOWEVER. r does Not equal impedance... it equals resistance... resistance is not the same as impedance... Z = Impedance (ohm) R = Resistance (ohm) XL = Inductance Reactance(ohm) where Z=the square root of (R^2+XL^2) The total impedance is not simply the algebraic sum of resistance and inductive reactance. Since the inductive reactance is 90 degrees out of phase with the resistance and, therefore, their maximum values occur at different times, vector addition must be used to calculate impedance. and to calculate inductive reactance you need to know the inductive force of the driver in Henry's and the frequency at which you are trying to measure then you use the formula XL=2(pi)fL where XL= Inductive Reactance (ohm) pi=exact number, which is about 3.1416 (constant) f=frequency L= inductance in Henry's so in answer to the OP's question... unless you have a program that will calculate it for you... u might want to let the big dogs handle it. [/QUOTE]

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