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Physics
Classical Physics
Thermodynamics
AC Alternator Load Loss on Engine Performance
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[QUOTE="CWatters, post: 5509181, member: 423469"] If we assume the alternator generates 14V at 100A then the power delivered by the alternator is 1400W. An alternator isn't 100% efficient so the engine will need to produce more power than that. This paper suggests alternator efficiency ranges from 55% to 80% and the belt driving it around 97% efficient. [URL]http://www.delcoremy.com/documents/high-efficiency-white-paper.aspx[/URL] So if we assume 55% the engine would have to deliver 1400 * 100/55 * 100/97 = about 2600W. That's the power the engine would have to generate if the alternator was running continuously at 1400W. If it's just for 0.01 seconds that equates to 2600 * 0.01 = 26 Joules. For reference a AA battery might contain about 5400 Joules of energy. However what does the alternator do the rest of the time? Typically it's still turning so the engine will still experience losses and these could be considerable and more important than what it's doing for the 0.01 seconds. [/QUOTE]
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Physics
Classical Physics
Thermodynamics
AC Alternator Load Loss on Engine Performance
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