Date: Wed Nov 29 20:40:57 2006 Back to Contents

Author: Frank Cascarano

Subject: Cars, lights, and mileage - was Re: The Inconvenient Truth

Post:
A nice demo to show this is turning a hand generator with the leads open
(very easy to turn) and then turning it with a light bulb hooked up (more
difficult to turn).

I read that there is a big push to develop LED headlights for cars for just
this reason. Their lower energy consumption would add up to huge gas
savings (a very small impact per car multiplied by a large number of
cars). This is especially true now that most cars have daytime running lights.

The same article said that the standard 12 V car battery would be changing
soon to a higher voltage. If I remember correctly, 48 volts will be the
standard car battery very soon.

-Frank


At 03:47 PM 11/29/2006, you wrote:
>I think the clearest way to see the connection is to look at energy. Aside
>from rolling down hills, the only energy input to the car comes from the
>gasoline in the tank. That energy makes the car go, runs the AC, runs the
>generator that charges the battery, etc.
>
>Of course, if you charged the battery by plugging the car into a charger
>every night, then the electric outputs like the radio would not be getting
>their energy from the gasoline.
>
>-----Original Message-----
>From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
>Behalf Of Anthony Lapinski
>Sent: Tuesday, November 28, 2006 6:39 PM
>To: tap-l@lists.ncsu.edu
>Subject: Re: [tap-l] The Inconvenient Truth
>
>This may seem tangential, but I've often heard/read that you get better
>gas mileage with the radio/AC off. Can anyone explain why this is the
>case? To me, the battery supplies energy to power the lights, radio, and
>fans, while the gas is used (via the spark plug, etc.) to run the engine.
>I don't fully understand the battery/gasoline connection and why less
>battery use equates to improved gas mileage.
>
>tap-l@lists.ncsu.edu writes:
> >I drove my 1995 Lincoln Town Car almost 200,000 miles in ten years
> >getting 20.5 miles per gallon. I always drive with windows up and A/C on
> >and often listen to the radio.
> >
> >I traded it in for a 2005 Lincoln Town Car that, after almost 23,000
> >miles, gets only 19.5 miles per gallon, but the ride remains excellent.
> >
> >In the first instance, I had many more 600 mile trips. I often drove to
> >College Park (310 miles) without stopping, only filling up when starting
> >back and not having to stop again. The convenience is great and I like
> >the added insurance.
> >
> >John Hubisz
> >
> >
> >Zigmund J. Peacock wrote:
> >
> > Taplers, I like Dave Sturms comments and agree wholeheartedly.
> > My "two bits" is related to fuel economy, the Toyota and Nissan only
> >slightly better fuel mileage than my monster. And the small V8 engines
> >both Ford and Chevy build are more fuel efficient than any V8 offered by
> >the Nissan/Toyota brigade.
> > Incidentally my big engine sits home and I ride the bus to work,
> >using my truck to tow my toys on weekends.
> > Zig
> >
> >David Sturm wrote:
> >
> >
> >
> >Perhaps this discussion should occur on an alternate list from tap-l?
> >I'll look to see to creating something on Yahoo groups that we could all
> >share since I'm not sure how Al Gore's politidocumentary affects my
> >ability to work with physics
> >laboratory, lecture and education...
> >
> >My only contribution to the thread will be to correct an extreme factual
> >error presented here, because I believe it disparages the real American
> >car industry, of which I have a number of relatives employed in...
> >
> >[ mailto:tap-l@lists.ncsu.edu ]tap-l@lists.ncsu.edu on Saturday, November
> >25, 2006 at 6:08 AM -0500 wrote:
> >:...
> >
> >
> >
> >
> >
> >The reason Toyota as a car manufacturer does extremely well in comparison
> >to the economically protected American car industry is the mere fact that
> >they have been optimizing their cars for less resource consumption for
> >decades already.
> >
> >
> >
> >
> >...
> >
> >
> >
> >
> >I know slagging America seems to be popular, but Toyotas and Hondas and
> >most other "so-called imports" driven in the United States are by far
> >produced *in* the United States, and are part of the American car
> >industry, employing American engineers,
> >and American scientists, many of whom received their physics education in
> >our PIRA-supported classrooms... I've had cousins employed at the Honda
> >plant northwest of Columbus, Ohio near Marysville, Ohio since the plant
> >opened in 1982
> >
> >[ http://www.ohio.honda.com/ ]http://www.ohio.honda.com/
> >
> >It's "more American" than Ford plants in Mexico, GM plants in Canada,
> >etc. BMW manufactures in South Carolina... Mercedes in Alabama... and
> >the list goes on... And Daimler-Chrysler... is a German company now, not
> >an American one. And even that's
> >really meaningless in this day and age. My stock portfolio has Honda in
> >it (NYSE: HMC), as do many of its employees in the U.S....
> >
> >There's no economic protection in the United States, clearly. Ford and
> >GM's problems have to do with union contracts they negotiated in the
> >1960s and 1970s that gave liberal benefits to retirees until death. They
> >can't numerically sell the number
> >of cars that supports that pension overpromising... Because they
> >overspent on labor, they ceased putting quite as much into R&D... and
> >make economic decisions that aren't based on supply and demand.
> >
> >====================================================
> >David E G Sturm - [ mailto:sturmde@maine.edu ]sturmde@maine.edu -
> >1.207.581.1241
> >--Physics & Astronomy Instructional Laboratories
> >--Bennett Hall Lecture Demonstration Facilities
> >--Mainely Physics Road Show
> >Dept of Physics & Astronomy -- University of Maine
> >5709 Bennett Hall -- Orono ME 04469-5709
> >[ http://www.physics.umaine.edu/ ]http://www.physics.umaine.edu/
> >====================================================
> >
> >
> >
> >
> >
> >
> >
> >--
> >Zigmund Peacock
> >University of Utah/Physics
> >115 SOUTH 1400 EAST #201 Tel 801 581 6602
> >SALT LAKE CITY UT 84112-0830 Fax 801 581 4801
> >
> > "We sleep safely in our beds because rough men stand ready in
> >the night to do violence to those who would do us harm"
> > -- George Orwell
> >
> > "All that is necessary for the triumph of evil is that good
> >men do nothing!"
> > -- Edmund Burke
> >
> >
> >


From tap-l-owner@lists.ncsu.edu Wed Nov 29 20:40:57 2006

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