Number 1 –> What’s the difference between resistance, reactance, and impedance?

DC circuits are relatively easy to analyze, due to current flowing in one direction, with resistance being the main element of the circuit. AC circuits, on the other hand, are more complex, since voltage and current alternate direction with a given frequency. Whereas dc circuits have resistance, ac circuits often have resistance and another property, known as reactance. Impedance is the combination of resistance and reactance.

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