# What is "Apparent Power" (VA)?

iScience
In school I learned about impedance:
where..

$$Z^2 = R^2 + X_{net}^2$$

but this was the only triangle I recall learning about.
The picture below I definitely do not recall.

The only quantity I am familiar with is the x-axis (Power).

If someone could explain apparent power and its importance with finding an appropriate UPS device, please throw me a bone. ty

berkeman