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Date: 18 Jan 2002 17:04:55 GMT
From: davehinznopsamcop.net
Subject: Re: Parking lights??


Bob <uctraingNOSPAMnopsamanet.com> pressed random keys until the following was produced: > On 17 Jan 2002 15:41:14 GMT, davehinznopsamcop.net wrote: >>There are about 746 watts to one horsepower, so the lights are about >>1/8th of a horsepower. > I'd have to disagree with your theory, based on practical experience. > Start your car. Turn the lights off and on. Watch the idle speed > increase and decrease. If it was only 1/8HP, it would not change > the engine speed. OK, then you do the math & get back to me. Perhaps you're seeing an inrush current or something, but the fact remains, that there are 746 watts to one horsepower, so unless you're using a bank of aircraft landing lights for your car, lighting load in a steady-state situation is trivial compared to the amount of power used to move the car around. > I don't know enough about engineering to calculate the force, but > the electrical load that's transferred to the alternator results > in a significant drag. For a very short time, perhaps. Gotta heat up the filaments; once they're hot, the load probably goes down. > Also, I think if you add up all the lights > that come on - head, parking, side - , it's more than 100watts. OK, 200 watts, 1/4 of a horsepower. Or even 400 watts, at 1/2 HP. Same idea, though. > But, I was being a little facetious anyway. I turn my lights on > whenever I think they will help - gray days, mountain passes, > etc. I really don't need them driving to the grocery store in > the middle of summer. I leave 'em on all the time, so I don't forget to turn them on. Dave Hinz

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