Signal variance and power connection

1. How is variance related to power?
2. Is variance and power same?
3. What is signal variance?
4. Why is noise power equal to variance?

How is variance related to power?

Variance power is the power to redirect the use of transferred assets to a different beneficiary. The donor of an asset grants variance power to the recipient by making a variance power statement in the documentation authorizing the asset donation.

Is variance and power same?

We can describe variance as the averaged power of the signal's random deviations expressed as power. This means that variance doesn't have the same unit as the values that we started with. If we're analyzing fluctuations in a voltage signal, variance has units of V² instead of V.

What is signal variance?

The variance of a discrete-time signal is the square of the standard deviation of the signal. Variance gives a measure of deviation of the signal from its mean value.

Why is noise power equal to variance?

A random variable's power equals its mean-squared value: the signal power thus equals \mathsfE[S^2]\ . Usually, the noise has zero mean, which makes its power equal to its variance.