--_003_20131122225701GA18215usnetrekorg_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable On Fri, Nov 22, 2013 at 11:56:48AM +0000, Lindy Mayfield wrote: > I've been having some problems understanding the basics of > electricity, and I think I understand some reasons why. When > learning new things I also have to remember to un-learn some things. Yes! A simplified explanation is, in effect, a kind of lie. Children are given simplified explanations as a matter of efficiency and effectiveness. Gradually, the earlier explanations are expanded upon with new learning, some of which contradicts earlier explanations, or the unspoken assumptions that were based on those earlier explanations. For more on this, Douglas Adams wrote about "lies to children", and the honoured profession of teacher, who is someone who can craft a story that is consistent and believable at a low level of detail. -- For the two dials on your bench power supply, imagine this, or see attached; - an x-y graph, the x axis is voltage, the y axis is current, - the voltage dial sets a limit on the voltage; let's use 12V, and draw a vertical red line, - the current dial sets a limit on the current; let's use 12A, and draw a horizontal red line, - the two red lines meet at 12V 12A and define limits of the power supply, the operating area is to the left, - if the bench power supply has a display of voltage and current, these tell you where you are on the graph, Now, let's imagine trying two ten watt resistors one by one; - the power rating is a curve; let's use green, formula is P =3D VI, - the safe operating area is to the left, overheating area to the right, - one resistor is half an ohm, so we can draw how it will behave; let's use blue, formula is I =3D V/R, - one resistor is ten ohms; let's use purple, - see how as the voltage rises, the current rises much faster in the half ohm resistor than the ten ohm resistor, Imagining or drawing a graph like this can help you understand how things work, and predict what will happen. In this example, both resistors will burn if the power supply is set to 12V 12A; - the ten ohm resistor will draw 1.2A, the voltage will remain at 12V, and this is 14.4W, in the overheating area of the green curve, - the half ohm resistor would draw 24A if the power supply was willing, but with the 12A limit the voltage should drop to 6V, and this will be 72W, well into the overheating area of the green curve. Overheating resistors is dangerous, though not as dangerous as some other things. You can get heat, fumes, smoke, fire, and even arcs. But if you want those things, there are better and cheaper ways. ;-) -- How did I make this graph? Gnuplot, with commands: set arrow from 12, 0 to 12, 12 nohead set arrow from 0, 12 to 12, 12 nohead w(x) =3D 10/x r1(x) =3D x/0.5 r2(x) =3D x/10 plot [0:15] [0:15] w(x), r1(x), r2(x) --=20 James Cameron http://quozl.linux.org.au/ --_003_20131122225701GA18215usnetrekorg_ Content-Type: image/png; name="test.png" Content-Description: test.png Content-Disposition: attachment; filename="test.png"; size=13903; creation-date="Fri, 22 Nov 2013 23:10:04 GMT"; modification-date="Fri, 22 Nov 2013 23:10:04 GMT" Content-Transfer-Encoding: base64 iVBORw0KGgoAAAANSUhEUgAAAV4AAAEGCAIAAACilGrXAAAABmJLR0QA/wD/AP+gvaeTAAAgAElE QVR4nO2deVxUVf/HPzMMOwgIKoILuFGojyASUipqGppmipa7jwuZmvhImWIulUu5lZrlUrkFCdli Be4VobilAiraTxEFBBFlEGFGGJY5vz9uTiMMwyx3GWbO++Wr18zl3PP5ntu9nzn33HO/R0QIAYVC oTyNWOgAKBSKKUKtgUKhaIBaA4VC0QC1BgqFogFqDRQKRQPUGigUigaoNVAoFA1Qa6BQKBqg1kCh UDRArYFCoWiAWgOFQtEAtQYKhaIBag0UCkUD1BooFIoGzNYajuDIp/g0G9lCB2L+rFmDI0eEDoLC NqImmq9BJBIJHQKFYqKwclE34V4D0cpsMhsEW8lW7cUapVEhFuFNiy2h0lLSrh0ByPvvcyukC03u 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