The ratio of voltage and current in the complex plane. Drop the “harder” and “easier” analogies with Ohmic resistors. They’re confusing, with impedance you’ve

The ratio of voltage and current in the complex plane. Drop the “harder” and “easier” analogies with Ohmic resistors. They’re confusing, with impedance you’ve gone up a level and the analogy breaks down. Even “matching” Z is kinda meaningless if you don’t express it as a complex quantity: what you’re trying to match is not |Z| but Z* (otherwise it is possible to match |Z| And deliver no power! In practice matching |Z| is good enough) What if you don’t know about phasors and Fourier transforms? Doesn’t matter, don’t look down on people to over simplify. Use the magnitude and angle formulation of complex numbers and build on that with pretty pictures.