power and energy signals

energy and power signals

how to judge so as to which limit in integral should be taken in case of finding energy or power signals?
o to infinty or -infinty to infinty?

Hi,

do you mean how to integrate to determine the energy or power?

find the energies of the signals

i waz jst askin as i dont understand y at some places we use integral 0 to infinity or-infinity to infinity or x1 to x2??

energy signals and power signals

Energy supplied requires ingegration over the interval of time over which the energy is estimated. Power is the rate at which energy is being used or the energy per unit time, in theis case integral could be (not necessarily) over one second. This matter gets simplified if the signal is lke AC or square wave with known periodicity. In such a case you find the energy over one cycle, from this power and energy etc can be estimated.

energy power signals

It depends on what you want to compute.
Energy is a measurement of total strength, just like fuel.
The longer you measure the consumption, the more usage being clocked.
Like our home energy/water meter.
You might at one moment want to measure the consumption
from time 3sec to time 40sec.
The result is the energy that is used for this time period.
If you want to measure the total energy used,
we integrate from -infinity to infinity.
In practise integrating -infinity to infinity,
the contexts is not so clearly define.

Power is the rate of energy consumption.
Power = Energy/1sec
You can think of it as the average energy used for 1sec period.
Useful for projecting the energy consumption over a period of time.
Which is why equipment rating is in wattage.
We don't know how long we will turn on the equipment.
The longer you turn on, the more energy you use.

Best Regards,
Siong Boon

power signals

ok nw i got it
thanx a ton 2 all of u for helping me out..