I know how to find the power and the energy of a signal. What I have a problem with is knowing whether a signal is an energy signal or a power signal.
According to my teacher, a signal is a power signal if its power is finite (less than infinity) and non-zero and a signal is an energy signal if its energy is finite (less than infinity). What he does not specify is what happens if the energy of a signal is 0 such as in the case of the signal x(t) = 0.
The energy is obviously 0. Is this signal considered an energy signal or the signal x(t) is not considered a signal at all since its zero?
Furthermore, is it possible for a signal to be neither a power signal nor an energy signal?