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## #1 2013-05-01 08:22:28

clumsy shark
Member
Registered: 2012-01-07
Posts: 13

### Electrical Engineering

calculate form factor

Kindly illustrate

i guess this is DC

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## #2 2013-05-01 08:54:18

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: Electrical Engineering

Hi;

Try this:

http://www.electronics-tutorials.ws/acc … eform.html

I thought it was only for AC and periodic or pulsing DC.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #3 2013-05-05 04:58:40

debjit625
Member
Registered: 2012-07-23
Posts: 101

### Re: Electrical Engineering

Well the image is not good enough to show any kind of electrical transient.But I guess its a pulse..
Any current which is not constant as in case of DC ,is reffer to as AC,even a pulse. In your image it looks like a DC transient.As AC is not constant they are measured differently than DC.In any circuit AC could be measured with Average,Peak-to-Peak,or RMS value.

Now the form factor is the ratio of RMS and Average value.

Good Luck

Debjit Roy
___________________________________________________
The essence of mathematics lies in its freedom - Georg Cantor

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## #4 2013-05-05 07:27:13

Mrwhy
Member
Registered: 2012-07-02
Posts: 52

### Re: Electrical Engineering

I agree with Debjit
Normally used for alternating current
For your two pulses, their areas may be the same.
The rms current is the steady current that would deliver the same heat per second or power.
But your currents ARE steady - so the rms is the same as the peak current
And if the two areas (peak times duration) are equal, such a current in a resistor would deliver the same heat!
The form factor of each is 1

Last edited by Mrwhy (2013-05-05 07:30:39)

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## #5 2013-05-05 19:56:49

debjit625
Member
Registered: 2012-07-23
Posts: 101

### Re: Electrical Engineering

@Mrwhy
I think the form factor is not 1,as its the case of a square wave,but in the image posted by the OP its not clear what is the time period of the pulse so we can't regard it as a square wave.

For a pulse wave form factor is

where,D is the duty cycle i.e.. the ratio of the time when the pulse is high and the full time period of the pulse.

Good Luck

Last edited by debjit625 (2013-05-05 19:57:52)

Debjit Roy
___________________________________________________
The essence of mathematics lies in its freedom - Georg Cantor

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## #6 2013-05-06 05:02:07

Mrwhy
Member
Registered: 2012-07-02
Posts: 52

### Re: Electrical Engineering

The form factor is for the entire duration of the pulse
So whether the areas be equal or not the form factor of each pulse shown is 1

The amplitudes differ but form factor refers to EACH ONE taken in ISOLATION
Of course for a pulse preceded and followed by zero for alltime, the mean  is zero!
0/0 is by mutual agreement, to keep us partially sane, considered to be meaningles.

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## #7 2013-05-08 07:44:01

clumsy shark
Member
Registered: 2012-01-07
Posts: 13

### Re: Electrical Engineering

Thank you all for your great Help
sorry if the given is not enough but this what our Dr wrote ,so I'll solve it for DC THANK YOU ALL

Last edited by clumsy shark (2013-05-08 07:44:26)

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