Ford 9N, 2N & 8N Discussion Board|
Re: Re: Re: Re: Re: Resistor or voltage reducer?????
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Posted by Dell (WA) on October 25, 2000 at 12:02:58 from (188.8.131.52):
In Reply to: Re: Re: Re: Re: Resistor or voltage reducer????? posted by rbell on October 25, 2000 at 10:29:02:
rbell.........need a refresher course on wetcell batterys? (grin)
Basically, batterys change chemical engergy to electrical energy and store electrical energy as chemical energy. Amount of power (amps) is a function of plate area. Voltage is dependent upon type and number of cells. Wet cells produce about 2.1 volts, dry cells about 1.5 volts. Chemical reactions generally depend on tempature. ie...cold batterys (-20 F) are slowwww w w w ..w ...w
Cold engine oil? drags the rotating masses. Starter needs more power (amps). As starter demands more amps from cold battery, the battery can not produce enuff amps, this shows up as lower battery voltage. Lower battery voltage, lower sparkies. Just when you need hotter sparkies to start that unvaporized gasoline.
Howsomever, behold the automagical "ballast resistor" that has lower resistance when cold and more resistance when hot. Just what the coil needs, more power. Vola' hotter sparkies, rumpa, rumppa, rummmmppppaaaaaa, chugga, chuckggaa.....
Solid state regulators still need to disapate the "unused" or excess power. That is, if you design a regulator for 6 volts at 3 amps output and your source is 12 volts, then the source must also provide 3 amps. Sumptn' about laws of conservation of energy. Kerchoff Laws, Ohms Law and a bunch of lawyers.
Low Tech devices like "ballast resistors" do this extreamly efficently, with acceptable tollarance, and cheep........Dell
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