How to calculate the energy and power of a signal?

In summary, the conversation discusses the difference between power signals and energy signals and how to determine them. It is mentioned that power is calculated as voltage multiplied by current, and energy is the time integral of power. The example given, e^j(2t+π/4), is a sine wave that does not provide any information about power or energy.
  • #1
Manoj Sahu
54
1
I would like to improve my knowledge of signals. I just came across this topic while reading a book. So I would like to know how to find out that the given signal is power signal or energy signal. For example please solve the following and give your explanation in reference to that.
e^j(2t+π/4)
 
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  • #2
I don't know what power signal or energy signal mean.

Power is voltage times current, P=V*I. You calculate that instantaneously. You can also calculate an average over any period you wish. Energy is the time integral of power. Those statements apply to all signals.

e^j(2t+π/4) is merely a sin wave. It tells you nothing about V or I or P or energy.
 
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Related to How to calculate the energy and power of a signal?

1. How do you calculate the energy of a signal?

The energy of a signal can be calculated by squaring each data point in the signal and then summing all of the squared values. This is also known as the squared integral of the signal.

2. What units is energy typically measured in?

Energy is typically measured in joules (J) or in electron volts (eV) in the field of physics and engineering. In signal processing, energy is often measured in terms of power, which has units of watts (W).

3. How is power different from energy?

Power is the rate at which energy is transferred or consumed. It is the energy per unit time. In other words, power measures how quickly energy is being used or produced.

4. Can you calculate the energy and power of any type of signal?

Yes, the energy and power of any signal can be calculated as long as the signal is continuous and has a finite duration. This includes both analog and digital signals.

5. What factors affect the energy and power of a signal?

The amplitude, frequency, and duration of a signal all affect its energy and power. Signals with higher amplitudes, higher frequencies, and longer durations will have higher energy and power values.

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