What is Energy Signal?
In signals and systems, the energy of a signal is a measure of the amount of work that the signal does or the amount of energy that the signal carries. Energy signals are periodic signals that have a finite or a bounded energy. The energy of a periodic signal is the integral of the square of the signal over one period. For a finite-energy signal, the energy is the integral of the square of the signal over the entire duration of the signal. Energy signals are important in many applications because they have finite power and they do not grow unbounded over time.
What is Power Signal?
In signals and systems, the power of a signal is a measure of the rate at which the signal does work or the rate at which the signal carries energy. Power signals are periodic signals that have a finite or a bounded power. The power of a periodic signal is the integral of the product of the signal and its time-delayed version over one period. For a finite-power signal, the power is the integral of the product of the signal and its time-delayed version over the entire duration of the signal. Power signals are important in many applications because they have finite energy and they do not grow unbounded over time.
Diagram of Energy Signal and Power Signal:
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Difference between Energy and Power Signal:
Text Version:
| SR. NO. | PARAMETER | ENERGY SIGNAL | POWER SIGNAL |
|---|---|---|---|
| 1 | Explanation | Energy signal is a measure of total energy contained in a signal. | Power signal is a measure of the rate at which energy is transmitted or used. |
| 2 | Representation | Energy represents the capacity to do work. | Power represents the rate at which the work is done. |
| 3 | Quantity Type | It is a scaler quantity. | It is a vector a quantity. |
| 4 | Type | It can be positive or negative. | It is always positive. |
| 5 | Energy/Power | Energy Signals have no power. (Power=0) | Power Signals have infinite energy. (Energy=∞) |
| 6 | Signal Type | Energy signals are non-periodic. | Power signals are periodic. |
| 7 | Example | Exponential Signal. | Sinusoidal or Square Wave signal. |
Image Version:
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