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I have bees in my epiglotis ![]() ![]() ![]() ![]() Group: Members Posts: 2,196 Joined: 7-February 03 From: Kennewick Man (E. WA State) Member No.: 266 ![]() |
QUOTE(rhodyguy @ Apr 25 2003, 08:17 AM) doesn't the battery provide the dc voltage and the alt provide the voltage to recharge? the inertia to drive the alt is most certainly less the stock fan, and the associated resistance the fan produces while pushing air. kevin The power required to spin the alternator is directly proportional to the load placed on it. One of the most enlightening (no pun intended) science demonstrations I participated in as a kid was spinning a hand-cranked generator while various loads were applied to it. No load, easy to turn. Flip on a single 60w light bulb and it gets hard to turn. Turn on 3 x 60w lightbulbs and you can't even turn the crank there is so much resistance. Your engine experiences the same thing when you apply electrical loads to the alternator. A 90amp alternator can output 1,125 watts at 12.5 v. Even at 100% efficiency that would require 1.5hp off the crank. (I don't know how efficient automotive alternators are, but it's not 100%) -Ben |
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