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1/6 of the volts?

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TIMW(PA)

11-28-2004 21:04:44

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I noticed that both figures for the internal resistance was roughly 1/6 of the input voltage. I'm just curious is there a formula or mathamatical stuff causing that or just chance

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Bob

11-28-2004 21:36:16

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Re: 1/6 of the volts? in reply to TIMW(PA), 11-28-2004 21:04:44

Average ignition system current draw is about 4 amps, to stay within what the breaker points can handle.

12 Volt coil resistance, plus the "1/2 Ohm trick resistor" give a resistance of about 3 Ohms, so (nominal) 12 volt supply voltage/3 Ohms = 4 Amps.

6 Volt coil resistance, plus the original ballast resistor = about 1.5 Ohms, so (nominal) 6 Volt supply voltage/1.5 Ohms also equals 4 Amps.

In both cases, the combined coil and resistor resistance results in about 4 Amps of igntion current at the particular operating voltage.

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thanks . . . Dell (WA)

11-28-2004 23:38:02

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Re: 1/6 of the volts? Ohms Law in reply to Bob, 11-28-2004 21:36:16

Bob..... ...isn't it great to pick numbers you can do in your head (grin)..... ....good answer, Dell..... .Ohms Law still rules

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