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

calculate form factor

Kindly illustrate

i guess this is DC

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 81,616

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.I have the result, but I do not yet know how to get it.All physicists, and a good many quite respectable mathematicians are contemptuous about proof.**

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**debjit625****Member**- Registered: 2012-07-23
- Posts: 89

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.

In your case I cant calculate as it needs more information about the wave,it needs the time period of the pulse.

Good Luck

Debjit Roy

___________________________________________________

The essence of mathematics lies in its freedom - Georg Cantor

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

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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**debjit625****Member**- Registered: 2012-07-23
- Posts: 89

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

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

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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