Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: "Carlos E.R." Newsgroups: comp.os.linux.misc,alt.comp.os.windows-11 Subject: Re: Electicity Supply (Re: Pickup trucks for city boys) Date: Thu, 4 Sep 2025 18:06:06 +0200 Lines: 67 Message-ID: References: <106mke5$1di32$1@dont-email.me> <108hddu$3bl64$2@dont-email.me> <108leod$b9i7$1@dont-email.me>

<05f9olxd4v.ln2@Telcontar.valinor> <108u7js$2f7ql$3@dont-email.me>

<7_GcnXdgUOPflyj1nZ2dnZfqnPadnZ2d@giganews.com> <10945fs$3s2ip$1@dont-email.me> <10947c9$3sdfi$3@dont-email.me> <1096mlr$fvap$1@dont-email.me> <9kojolxgnh.ln2@Telcontar.valinor> <1099boq$14pk5$1@dont-email.me> <6rOcnT-ikrnKpSX1nZ2dnZfqn_adnZ2d@giganews.com> <1099pev$18dit$2@dont-email.me> <109c2ms$1pa17$1@dont-email.me> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: individual.net XKziEL/Y6GyZALxQz2fJwA6ljo8e/U35iihzF3g7nng4XAYDY+ X-Orig-Path: Telcontar.valinor!not-for-mail Cancel-Lock: sha1:pvQoCWLnY8mCfkGfQ1mTkzi5L0Q= sha256:eL0qi/xU+T1WZs3xA8ojbEIHtJF0J2eQxXbuOkomtoY= User-Agent: Mozilla Thunderbird Content-Language: es-ES, en-CA In-Reply-To: <109c2ms$1pa17$1@dont-email.me> Xref: csiph.com comp.os.linux.misc:73384 alt.comp.os.windows-11:23804 On 2025-09-04 15:03, Daniel70 wrote: > On 4/09/2025 2:13 am, The Natural Philosopher wrote: >> On 03/09/2025 13:44, c186282 wrote: >>> On 9/3/25 8:20 AM, Daniel70 wrote: >>>> On 3/09/2025 4:11 am, Carlos E.R. wrote: >>>>> On 2025-09-02 14:28, c186282 wrote: >>>>>> On 9/2/25 8:07 AM, Daniel70 wrote: >>>>>>> On 1/09/2025 11:34 pm, The Natural Philosopher wrote: >>>>>>>> On 01/09/2025 14:02, Daniel70 wrote: >>>>>>> >>>>>>> >>>>>>> >>>>>>>>> And, as I've mentioned before, here in Australia, our "Mains" >>>>>>>>> is 240V RMS so peaks out at about 340V between the Active wire >>>>>>>>> and the Neutral/Earth. >>>>>>>> >>>>>>>> Everywhere it's R.M.S. Which is why mains reservoir caps in an >>>>>>>> SMPS are 400V rated as are the diodes feeding them... >>>>>>> >>>>>>> Somewhere here I read where someone refered to a 120V supplied >>>>>>> that they typed was 90V effective. To me, 120V peak would be >>>>>>> about 90V RMS (or effective). >>>>>> >>>>>> Roughly, yes. It's sort of the REASON for 120vac - because >>>>>> the effective energy is about the same as Edison's old 90vcd >>>>>> service. >>>>> >>>>> There is something wrong with that. 120ac rms aka 170ac *ptp* has >>>>> the same thermal effect as 120 dc. >>>> >>>> Sorry, Carlos, but is that "ptp" supposed to mean "Peak to Peak" >>>> i.e. from Most Positive Value to Most Negative Value?? i.e. Double >>>> the Peak Value and almost TRIPLE the RMS value?? >>>> >>>>>> "AC/DC" appliances, "universal motors", work because 120vac >>>>>> and 90vdc are very similar in some important ways. >>>>>> >>>>>> USA had to support competing systems for quite awhile. >>> >>> >>> Just look at what you get if you put the 120vac through >>> a full-wave rectifier with a load. It's close, though >>> not exactly of course, equiv to 90vdc. >>> >> No., with capacitative smoothing its nearly 168V DC >> Its still 120V RMS, even though the waveform is kooky. >> Its never equivalent to 90V DC in any universe I know of. > > Sorry!! WHAT?? By feeding in a 120V RMS waveform, how the hell do you > get anywhere near 168V DC?? > > The 120V RMS waveform has a Peak Positive Value of +170V and a Peak > Negative Value of -170V. > > How could you possibly expect to get an AVERAGE (smoothed) value of 168V > DC?? > > If you Full wave rectified the Sine Wave (so you had two Positive bumps > per Cycle) and you then Filtered that (to produce DC), sure, you might > get an UNLOADED 170V DC'ish ..... but not very useful!! Actually, you also get nearly 170V dc under some load, with a good LC filter. If the load is higher, you need a transistor to smooth it out at a lower voltage. -- Cheers, Carlos.