How capacitor and inductor block DC?

First off, a capacitor blocks DC and is a lower impedance to AC, while an inductor tends to block AC yet pass DC very easily. By "blocking", we mean than it offers a high impedance to the signal we're talking about. First, though, we need to define a few terms to explain this.

You know what resistance is, right? Resistance is the opposition to current flow that results in the burning of power, measured in watts. It does not matter if the current is AC or DC, the power dissipated by a perfect resistor is the same amount for either.

So resistance is one kind of "impedance" to current flow. There are 2 others - "inductive reactance", and "capacitive reactance". Both are also measured in ohms, like resistance, but both are different in that, for one thing, they vary with frequency, and for another, they don't actually consume power like a resistance does.

So all together, there are 3 kinds of impedance - resistive, inductive, and capacitive. The amount of blocking or impedance of ... more.

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