Ohms law power problem
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From: Joe on 24 Jul 2010 18:49 In article <47hm46l8eaaj2q8glre6v406kta174qsub(a)4ax.com>, Jon Kirwan <snip> > In such cases, saying to "not make things more complex than > needed" is not entirely unlike Sheesh... enough already. The flame of interest can be extinguished by a flood of verbiage. --- Joe, MMX (get the water vs, fire imagery, huh? huh? :)) Or, as Einstein supposedly said, "Everything should be made as simple as possible, but not simpler." or as Einstein also supposedly said, "Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction." --- Joe PS: Beware of confusing (A-B)^2 with A^2 - B^2 and give hints to a neophye instead of a tidal wave of ... .
From: Jon Kirwan on 24 Jul 2010 19:11 On Sat, 24 Jul 2010 15:49:56 -0700, none(a)given.now (Joe) wrote: >In article <47hm46l8eaaj2q8glre6v406kta174qsub(a)4ax.com>, Jon Kirwan ><snip> > >> In such cases, saying to "not make things more complex than >> needed" is not entirely unlike > >Sheesh... enough already. > >The flame of interest can be extinguished by a flood of verbiage. ><snip> It sure can be. I suppose it's now up to Bill to say. Jon
From: Tom Biasi on 25 Jul 2010 12:03 "Bill Bowden" <wrongaddress(a)att.net> wrote in message news:5b096e94-89b8-416a-9095-004aabb5868e(a)k19g2000yqc.googlegroups.com... > Using a 12 ohm load and 12 volt supply, what is the power gain when > the voltage is raised to 12.1 volts? > > Considering the formula P=E^2/R the power at 12 volts will be 144/12 = > 12 watts. And, at 12.1 volts, the power will be 146.41/ 12 = 12.2 > watts, for a gain of 200 milliwatts. > > But if the current at 12 volts is 1 amp, and the current at 12.1 volts > is 12.1/12= 1.00833 then the increase is 8.33mA and from the power > formula of P=I*E we get .00833*12.1 = 101 milliwatts which is about > half as much as the first number. > > And,considering the increase in current, using the formula P=I^2 * R > we get .00833^2 * 12 = 833 microwatts, which ain't much. > > So, which is correct A,B C ? > > I vote for A > > -Bill > After reading all the responses I got dizzy and I have been teaching this for 40 years. You made a math error. You seem capable of catching it. Check your work. Tom
From: Joe on 25 Jul 2010 12:55 In article <4c4c604d$0$31276$607ed4bc(a)cv.net>, "Tom Biasi" <tombiasi(a)optonline.net> wrote: > After reading all the responses I got dizzy and I have been teaching this > for 40 years. Did that student finally learn it? --- Joe
From: Tom Biasi on 25 Jul 2010 13:03
"Joe" <none(a)given.now> wrote in message news:none-2507100955030001(a)dialup-4.231.175.183.dial1.losangeles1.level3.net... > In article <4c4c604d$0$31276$607ed4bc(a)cv.net>, "Tom Biasi" > <tombiasi(a)optonline.net> wrote: > >> After reading all the responses I got dizzy and I have been teaching this >> for 40 years. > > Did that student finally learn it? > > --- Joe Good one:-) |