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# What is the physical meaning of energy and power signal?

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#### brahma

energy signal +power signal

i want to know the what is the physical meaning of energy and power signal

johanan

### johanan

Points: 2

#### maui

##### Member level 3
Re: energy and power signal

brahma

I think I remember from uni.

An energy signal is one of infinate energy, but finite power, so an infinate (length) periodic level bounded signal. IE sinewave, like what you get from you electricity mains.

A power signal is one of infinate power, but finite energy. So an infinate level but finite time. Like a delta function, or transiant spike.

Hmmmm, but it could be the other way around as it has been years since I was at uni.

Maui

#### electronics_kumar

Re: energy and power signal

maui

An energy signal is one of infinate energy, but finite power, so an infinate (length) periodic level bounded signal. IE sinewave, like what you get from you electricity mains.

A power signal is one of infinate power, but finite energy. So an infinate level but finite time. Like a delta function, or transiant spike.

i am some reservations against Maui views .....
both are mutually exclusive
power sig will have finite power and infinite energy; it is periodic
energy signal will have finite energy and zero power; it is aperiodic
there are aslo which is power and energyone eg is t*2

let the debate continue so that solution/answer will born

#### Sangal B P

##### Newbie level 2
Energy of a signal is just integration over time....... But My question is why integration over square of the signal...
???

#### bulx

##### Full Member level 4
Re: energy signal +power signal

Energy signal is one which has finite energy, so that it makes sense to talk about its energy, more than its power. Like a limited duration signal whose square will sum up to a finite number, but power is zero. A power signal is one that has finite power, like a periodic signal whose square integrated over all time is infinity (means inifinte energy), but averaged over time gives a finite value.
An ever increasing signal has infinite power and infinite energy, so is neither a power signal nor a energy signal
-b

- - - Updated - - -

power = VI = V^2 /R = I^2R. thats why
-b

Points: 2

Points: 2

### johanan

Points: 2

#### Sangal B P

##### Newbie level 2
Re: energy signal +power signal

Thanks bulx.......

#### shams82

##### Newbie level 1
Re: energy signal +power signal

that is a helpfull answer. but can you tell us please - me and brahma- why or where we use this cassifiation of signals?
i'm reading about it in a book about signals and systems but i haven't found a practical use for it in my study yet, so even i understand it the way you put it, i can't attatch this information to a practical example. thanks alot

#### Bhuvanesh Nick

##### Member level 1
Re: energy signal +power signal

i too have that doubt

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