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  • Subject: What's the equation for alternating current?
Subject: What's the equation for alternating current?
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  • 12.03.2012 10:29 AM PDT

This is the way the world ends,
This is the way the world ends,
This is the way the world ends;
Not with a bang but a whimper.

Add a negative sign to one, and those two equations should be equivalent, should they not? So it really just depends on the direction of the current, or whether or not you use real or normal current in your equations.

  • 12.03.2012 10:31 AM PDT

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V(t) = Vp*sin(w*t)

Where w is the angular frequency of the voltage, given in radians per second, t is time in seconds, and Vp is the peak or maximum voltage.

  • 12.03.2012 10:34 AM PDT


Posted by: xXIHAYD0IXx
Add a negative sign to one, and those two equations should be equivalent, should they not? So it really just depends on the direction of the current, or whether or not you use real or normal current in your equations.


You think sin(30)=-cos(30)?

OT: You have to technically add some number to one of them to get the other but it doesn't really matter because you can start wherever you want. So you can write it either way. I've see in usually written as sin though I think.

  • 12.03.2012 10:35 AM PDT

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Posted by: Destined Fate
Thanks guys.

No problem fellow Floodian!

  • 12.03.2012 10:37 AM PDT
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KiLo SiErRa 13

V = Vpk * Cos(wt+theta)

Where Vpk is the peak voltage, t is time and w is 2*pi*frequency.

Sometimes Sin is used but the norm for electrical engineers is to use Cos when describing ac electricity. To convert the equation from sin to cos just minus 90 degrees from theta

  • 12.03.2012 11:12 AM PDT

I don't remember coming across that. What are you using it for? Generating a current or already in a current?

The only AC we study is I_(RMS)=I_0/[square root sign]2

I_(RMS)=I_0/2^(1/2)

[Edited on 12.03.2012 11:16 AM PST]

  • 12.03.2012 11:15 AM PDT