708 B
708 B
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Impedance is not the same thing as resistance although it is a related concept.
Resistance is opposition to the flow of current in both AC and DC circuits. It is a quantity that remains constant. Resistance in a circuit causes electrical energy to be dissipated as heat.
In contrast, impedance is not constant. It changes based on the frequency of the current and it only applies to AC circuits.
Impedance is calculated as the resistance plus the frequency-dependent opposition to alternating current from components such as capacitors and inductors.
Both resistance and impedance are measured in Ohms