Real power is the power burnt off in the resistive parts. Whenever you do a quick power calculation this is what you’re considering. This is not Vrms x Irms, it is the sum of V x I at each point
Reactive power is the energy that is stored and released by capacitors and inductors each line cycle. It briefly looks like energy is being consumed but you get it back
Apparent power is the combination of the two. You need to be able to source the apparent power and in certain applications it matters a lot. This is Vrms x Irms
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