P = Real Power | Q = Reactive Power | S = Apparent Power
Key Equations:
$$S = \sqrt{P^2 + Q^2}$$
$$\theta = \arctan\left(\frac{Q}{P}\right) \quad,\quad \mathrm{PF} = \cos(\theta)$$
$$P = S\cos(\theta) \quad,\quad Q = S\sin(\theta)$$