Understanding negative power in a time frequency heat plot

1. Why is 63.2 a time constant?
2. How do you calculate power factor correction?
3. What is the instantaneous power?
4. What is the frequency of power in an AC circuit?

Why is 63.2 a time constant?

A: Because the time constant of an increasing system is the time that it takes the system's step response (the resulting output when the input changes from zero to one very quickly) to reach 1 – 1/e of its final value. The value of 1 – 1/e is 0.632, or approximately 63 percent.

How do you calculate power factor correction?

Qc can be determined from the formula Qc = P (tan φ – tan φ'), which is deduced from the diagram. The parameters φ and tan φ can be obtained from billing data, or from direct measurement in the installation.

What is the instantaneous power?

Instantaneous power is the power measured at a given instant in time.

What is the frequency of power in an AC circuit?

and V=220 V. A. 50 Hz.