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Thanks Marcos. Both your explanations are valid. The sum that I referred to above is: Z = R + jX where Z is the impedance, R the resistance and X the reactance. Impedance extends the concept of resistance in DC circuits to AC circuits.
@M-A: Thanks for the lesson :) It takes be back ... 40+ years! But if you know (and understand...?) the theory and the terminology, why don't you bother to use it correctly when applying it to practical circumstances - e.g. in this question?
@ M-A: Also incorrect, on 3 counts: impedance is *not* the 'sum of...'; reactance cannot be equated to the resistance of an inductor/capacitor; 'total amount of resistance' is meaningless where there is a reactive component.