Before going to the next topic ie.Properties of discrete time signals we will just skim through the concept of power and energy signals.

**Energy of a signal**
Energy of a signal x(n) is given by

E= sigma n=-infinity to infinty |x(n)|

square
A signal is said to be energy signal if the energy of signal is finite, in that case power of the signal will be zero.

**Power of a signal**
Power of a signal is given by

limit N tends to infinity 1/2N+1 sigma n=-N to N |x(n)|square

A signal is power signal if power is finite, in that case the energy of signal will be infinity.

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