A coil has an ohmic resistance of 280 Ω and a self-inductance coefficient of 668.5 mH. The current through the coil is 0.6 A and f = 50 Hz. Calculate:
a) the absorbed power;
b) the apparent power;
c) the reactive power;
d) the reactive current.

(This level corresponds to the early college years for students studying subjects like physics or electrical engineering)​