Only AC can flow through 220R resistor, due to 10 μF coupling caps, the amplitude of which is in accordance with Q2 Collector output (+/- one diode forward voltage drop..)

Power dissipated is p = V

_{rms} X I

_{rms} = I

^{2}_{rms} X R = V

^{2}_{rms} / R and for instaneous power P = [V

^{2} / R] X cos(θ) or I

^{2} X R Χ cos(θ)

P.S.1

In case you worry for items power rating this should stand for 50k pot rather 220R..

(same or heavier series current for 220R and pot resistance, depending on wiper setting, but much higher value than 220R)

P.S.2

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*can anyone point me to resources to better understand how you holistically apply ohms law on a circuit*<

Simply by Kirchoff laws (KCL & KVL) implementation..