Battery starter guestion
Battery starter guestion
02-28-2003, 09:42 AM
#2
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CCA: Cold cranking amps. Maximum number of amps a battery can supply for 30 seconds at a temperature of 0 degrees F, before dropping to 7.2 volts.
I would say no. The voltage would not change with more CCA's. If you cranked it over for a long time, then yes. But any battery could do that.
I would say no. The voltage would not change with more CCA's. If you cranked it over for a long time, then yes. But any battery could do that.
Last edited by rimpainter.com; 02-28-2003 at 09:45 AM.
02-28-2003, 09:52 AM
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No, the voltage won't change relative to the max current. Apply Ohm's law V=IR. Voltage will always hover around 12.0 V. Thus the only thing you can vary is resistance which is in fact how the higher CCA voltage sources work.
More so than that, think of it this way. The total resistance of the system is what matters. The resistance of the wires from the battery to the starter is more or less constant for all the 4R's, as well as the induced resistance for the starter. Once again voltage is fixed, the resistance is fixed, the internal resisance of the battery is more or less neglidgable in nearly all cases (we'd be talking about 4th or 5th decimal place), thus output current must also be fairly constant from 4R to 4R.
We could attempt to test the idea by measuring current flowing from the battery during cranking for a couple of different rigs. I propose that they will be more or less equivilant.
You're fine with the new battery.
-Davis
More so than that, think of it this way. The total resistance of the system is what matters. The resistance of the wires from the battery to the starter is more or less constant for all the 4R's, as well as the induced resistance for the starter. Once again voltage is fixed, the resistance is fixed, the internal resisance of the battery is more or less neglidgable in nearly all cases (we'd be talking about 4th or 5th decimal place), thus output current must also be fairly constant from 4R to 4R.
We could attempt to test the idea by measuring current flowing from the battery during cranking for a couple of different rigs. I propose that they will be more or less equivilant.
You're fine with the new battery.
-Davis
02-28-2003, 02:35 PM
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i wish! I had a long writeup about the fuel atomizer discussion that was going on back in January, but after I wrote it, I realized that wasn't a registered member yet. Alas.
I'm a medical student with a masters in nuclear engineering and a b.s. in biological engineering. you get a pretty heavy dose of the physics that way.
-davis
I'm a medical student with a masters in nuclear engineering and a b.s. in biological engineering. you get a pretty heavy dose of the physics that way.
-davis
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