Resistance vs Impedance
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Resistance vs Impedance
Resistance and impedance both limit current. The key difference is that resistance stays fixed and impedance does not. Resistance is the same at every frequency. A resistor dissipates power as heat. That relationship does not change whether the signal is DC or 10MHz. Impedance changes with frequency. For a capacitor: Xc = 1 / (2 x pi x f x C ...
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