U(n) is energy or power signal

This signal is periodic since u(n) repeats after every sample and of infinite duration . Hence it may be power signal.

1. How do you know if a signal is energy or power?
2. What is the unit of signal energy?
3. What are the energy and power signals?
4. Is DC signal a power or energy signal?

How do you know if a signal is energy or power?

If x(t) has 0 < E < ∞ and P = 0 , then it is a energy signal, where E is the energy and P is the average power of signal x(t). The signal which has finite average power and infinite energy is called as power signal.

What is the unit of signal energy?

by Z_o, the characteristic impedance of free space (in ohms), the dimensions become joule-seconds per meter² or, equivalently, joules per meter² per hertz, which is dimensionally correct in SI units for spectral energy density.

What are the energy and power signals?

A power signal has infinite energy and an energy signal has zero average power. Transient (finite duration) signals are energy signals while periodic signals are power signals.

Is DC signal a power or energy signal?

The true DC signal should have an infinite extent hence infinite energy.