Impedance, with its complex mathematical formulae and terminology can be mystifying, I get it.
Here we strip back the terms and pare down the formulas to let that dangling penny drop.
So, lets dive in and get to grips with something you’ve probably have heard of but sometimes struggle to get your head around.
So - What Exactly is Impedance?
OK, so in DC circuits, where the current flow is steady, there is one type of opposition to this flow which is called “Resistance”.
AC circuits can experience resistance too, but they also can experience another form of opposition to the current flow, “Reactance”.
In AC circuits, then it is the combination of these two forms of opposition to current flow that is called impedance (impedance is signified by the symbol Z).
So essentially, in AC circuits, opposition to current flow is Resistance + Reactance = Impedance (Z).
Just like DC circuit resistance, AC circuit impedance is measured in ohms (Ω). Source: PCB Forum
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