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 [DPRG] Board indication of 120VAC Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] Next message: [DPRG] Board indication of 120VAC Subject: [DPRG] Board indication of 120VAC From: Jeff Sampson jsampson at pobox.com Date: Wed Jun 1 00:24:31 CDT 2005 ```Oh, so it is like magic. ;-) I guess this is the same concept as the ballast transformer on a flouresant light. Except it is capacitive reactance instead of an inductive reactance. > Message: 2 > Date: Mon, 30 May 2005 14:17:28 -0500 > From: "Rick Bickle" > Subject: RE: [DPRG] Board indication of 120VAC > To: "'Jeff Sampson'" , > Message-ID: <005a01c5654c\$3885f470\$6edf6d0a at MERCURY2> > Content-Type: text/plain; charset="US-ASCII" > > Jeff, > > No, the capacitor will not dissipate the same power as a resistor. > > In general terms, you can say that the capacitor has reactance Xc given > by 1/2(pi)FC, and use this to determine the average current flow through > the circuit branch. Since the capacitor is reactive however, it doesn't > actually work like a resistor. A capacitor of a given value and > frequency can only handle a limited current. The current is limited > because the capacitor's plates can only hold a certain number of > electrons. This limiting of current does not dissipate power as a > resistor does. So both resistors and capacitors (and inductors) can > limit current, but because a capacitor uses a different method, it does > not dissipate power and generate heat like a resistor. > > That being said, the capacitor will have some internal resistance and > will dissipate some power. To be more in depth, there is also power > factor to consider which increases losses too, but for simple circuits > like this, it's not usually important. > > Rick -- Jeff Sampson http://tcrobots.org/members/jsamp.htm ``` Next message: [DPRG] Board indication of 120VAC Message index sorted by: [ date ] [ thread ] [ subject ] [ author ] More information about the DPRG mailing list