E=IR in a circuit. To determine volt drop in a circuit it is a simple circuit resistance multiplied by the current. Simple ohms law and nothing squared. Bob refers to IR loss in the circuit feeding the amp as per above line and not meter efficiency equations.
Circuit; 1 ohm x 20 amp = 20v volt drop (120v) To halve current we doubled the voltage and reduced load by half with the same circuit(tap change etc). Circuit; 1 ohm x 10 amp = 10v volt drop (240v) Looks like a 50% loss(read reduction in volt drop) with current halved not 75% As far as power improvement(You see I removed the voltdrop at load end equation); 100 x 20 = 2000w 230 x 10 = 2300w So a 300w or 15% power improvement, and a much higher IMD improvement no doubt. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Monty Shultes Sent: Tuesday, 7 August 2012 5:00 AM To: [email protected] Subject: Re: [Elecraft] KPA-500 110 or 220? Actually it's "I-squared R drop", and a 1/2 reduction in current results in a 75% loss reduction. Monty K2DLJ On Aug 6, 2012, at 1:27 PM, Bob <[email protected]> wrote: > Electric meters measure current consumption on both 120v legs when > calculating total watt hour consumption. So it matters not one bit if > the loads are balanced or unbalanced from a billing point of view. > Rumors to the contrary are simply not correct. > > The reason for running the amplifier at a higher voltage is that it > will reduce the IR voltage drop. Because the operating voltage has > doubled, the required current has been cut in half. Therefore the IR > drop (loss in the > wiring) has been cut in half. > > 73, Bob, WB4SON > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net Please help support this email > list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
