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Electronics Forum / Basics / July 200612V 80Va Transformer
Help Please, Can somebody explain to me what 80VA Means for a transformer with 2 x 12V outputs, and 240V inputs. What I am interested in is the max amps I can pull per 12v output. If I connect the 2 off 12v outputs in parallel, does this mean I can pull double the current ? Cheers > Help Please, > [quoted text clipped - 7 lines] > > Cheers You can get 80/24=3.3A out of it when 12V outputs in series or 6,6A when in parallel. This applies for a constant load, regardless of the phase angle. When using rectifiers you have to use a correction factor. petrus bitbyter So why would anyone use the outputs in series? > > Help Please, > > [quoted text clipped - 13 lines] > > petrus bitbyter > So why would anyone use the outputs in series? > [quoted text clipped - 24 lines] >> >>petrus bitbyter To get 24 volts??? > So why would anyone use the outputs in series? Why would anyone answer such a stupid question ? Graham Because this is the place for stupid questions, and petrus bitbyter didn't mention the 24 volts in his original reply. He, however seems legitimately interested in using this place to discuss electrical questions, and not as a place to get frustrated. > > So why would anyone use the outputs in series? > > Why would anyone answer such a stupid question ? > > Graham <tapwater@roomtemperature.deg> = a very tepid drip > Because this is the place for stupid questions, ** Not from FUCKWITS or TROLLS like you - a.shole > and petrus bitbyter didn't mention the 24 volts in his original reply. ** I see you HAVE already wanked yourself BLIND - FUCKWIT Takes time to get used to using Braille. LOL ....... Phil >> > So why would anyone use the outputs in series? >> >> Why would anyone answer such a stupid question ? >> >> Graham > Because this is the place for stupid questions, and petrus bitbyter didn't > mention the 24 volts in his original reply. He did actually ( in an equation ) , but it went right over your dumb head. Graham >Because this is the place for stupid questions --- No, this is supposed to be the place where there _are_ no stupid questions. Stupid _posters_, however, are another matter, and you seem to be leading that pack by leaps and bounds. Learn to bottom post, dumbass.  SignatureJohn Fields Professional Circuit Designer >> So why would anyone use the outputs in series? > > Why would anyone answer such a stupid question ? > > Graham Be nice. This is .basics. We don't call newbies "stupid" here, we help them to understand. Ignorance is the first stage of Wisdom. Thanks, Rich >>> So why would anyone use the outputs in series? >> [quoted text clipped - 4 lines] >Be nice. This is .basics. We don't call newbies "stupid" here, we >help them to understand. --- And, if they're stupid, they need to be helped to understand that as well. --- >Ignorance is the first stage of Wisdom. --- No, it isn't. Recognizing one's own ignorance is. SignatureJohn Fields Professional Circuit Designer >So why would anyone use the outputs in series? --- Aren't you that same stupid, top-posting sonofabitch who made a complete a.s out of himself in that "downed powerline" thread? Geez, it seems like you'd have learned by now that nobody wants to read your sh.t. That's right. NOBODY. So why are you hanging around? Do you _like_ abuse or is it the only way you can get any attention? f.cking idiot. SignatureJohn Fields Professional Circuit Designer > Help Please, > > Can somebody explain to me what 80VA Means for a transformer with 2 x 12V > outputs, and 240V inputs. > > What I am interested in is the max amps I can pull per 12v output. Those outputs will each 'share' the 80VA i.e. 40VA each. So each winding is good for 40/12 A = 3.33A > If I connect the 2 off 12v outputs in parallel, does this mean I can pull > double the current ? In parallel that'll supply 12V @ 7.66A. In series it'll supply 24V @ 3.33A. Graham > > Help Please, > > [quoted text clipped - 11 lines] > > In parallel that'll supply 12V @ 7.66A. ooops typo ^^^^^ 6.66 A > In series it'll supply 24V @ 3.33A. > > Graham "Ian Tedridge" > Can somebody explain to me what 80VA Means for a transformer with 2 x 12V > outputs, and 240V inputs. ** It means the transformer will *continuously* supply 80 VA into to a load while remaining at a safe operating temperature - providing: 1. The load VA is divided evenly between the two 12 volt secondary windings. 2. The AC load current is symmetrical about + and - values, ie no half wave rectification is involved. Note: VA = total * rms * load current x rms voltage (12 or 24 in this case) ........ Phil > "Ian Tedridge" > > [quoted text clipped - 12 lines] > > VA = total * rms * load current x rms voltage (12 or 24 in this case) With most kinds of ( typically capacitor input ) rectification to DC - the current waveform crest factor / conduction angle influences the effective VA rating though. I.e. derate for equivalent DC watts. Or looking at it another way Irms is not equal to the normalised Iav for a sinewave. Graham "Eeyore" >> VA = total * rms * load current x rms voltage (12 or 24 in this >> case) [quoted text clipped - 5 lines] > another way > Irms is not equal to the normalised Iav for a sinewave. ** All TOTALLY covered by the VA figure since the definition of " VA " REQUIRES the * rms * value of the load current to be used. I must posted this at least 50 times on usenet . So no f.cking need to tell me - you pommy nerd. BTW Is the change of name a public admission you are bipolar ? ...... Phil > "Eeyore" > [quoted text clipped - 14 lines] > > So no f.cking need to tell me - you pommy nerd. I appreciate that *you* know it but I'll bet many ppl think you can draw the same 80W DC from a capacitor input rectifier connected to the same transformer. Not many ppl own true rms meters either btw. > BTW > > Is the change of name a public admission you are bipolar ? Nope. It was actually an indirect response to a nitwit in another group. It amused me. Feel free to say I'm easily amused btw. Graham "Eyesore" >> So no f.cking need to tell me - you pommy nerd. > > I appreciate that *you* know it ** THEN DO **NOT** f.cking POST IT TO ME !!!!!!!! POST IT TO THE BLOODY OP NOT UNDER MY WORDS - FUCKWIT !! >> Is the change of name a public admission you are bipolar ? > > Nope. ** Shame. ........ Phil > "Eyesore" > [quoted text clipped - 7 lines] > > NOT UNDER MY WORDS - FUCKWIT !! I think you're being a teensy bit too sensitive here Phil. It wasn't meant as a correction but an addition to what you said. Graham "Eeysore" >>>> So no f.cking need to tell me - you pommy nerd. >> > [quoted text clipped - 7 lines] > > I think you're being a teensy bit too sensitive here Phil. ** YOU have had many WARNINGS over doing the same thing. That para reads like its a smartarse correction - no-one here can read your bloody mind !! Post YOUR ideas to the OP. If you are NOT foolishly attempting to correct me - them make that CLEAR !!! ....... Phil >> "Eeyore" >> [quoted text clipped - 28 lines] > >Graham Phil is, apparently, never amused. Imagine living like that! John John Larkin wrote: > >> "Eeyore" > >> [quoted text clipped - 32 lines] > > John I can't. I would put a bullet through my brain, first. SignatureService to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida > John Larkin wrote: >> On Sat, 29 Jul 2006 07:18:45 +0100, Eeyore ... >> >> BTW >> >> [quoted text clipped - 10 lines] > > I can't. I would put a bullet through my brain, first. I concur, but slapstick and a two- or three-word vocabulary consisting primarily of cusswords can get a little tiresome. ;-) Cheers! Rich > Help Please, > > Can somebody explain to me what 80VA Means for a transformer with 2 x 12V > outputs, and 240V inputs. > > What I am interested in is the max amps I can pull per 12v output. 80VA / ( 12A * 2 ) about 3.33A > If I connect the 2 off 12v outputs in parallel, does this mean I can pull > double the current ? usually, yes, but don't get one of them backewards. that'd be about 6.66A Bye. Jasen "jasen" <jasen@free.net.nz> ( snip yet another ASININE copy cat post) ** f.ck OFF !!!!!!!!!!! you PITA, f.cking KIWI COPY CAT .......... Phil |
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