Date: Thu Nov 30 12:40:44 2006 Back to Contents
Author: John Welch
Subject: Re: Cars, lights, and mileage - was Re: The Inconvenient
That's interesting about the 48 V. Will a 48V battery capable of putting
out many amps be a safety hazard at all?
Frank Cascarano wrote:
> 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.
> At 03:47 PM 11/29/2006, you wrote:
>> I think the clearest way to see the connection is to look at energy.
>> from rolling down hills, the only energy input to the car comes from
>> 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
>> their energy from the gasoline.
>> -----Original Message-----
>> From: email@example.com [mailto:firstname.lastname@example.org] On
>> Behalf Of Anthony Lapinski
>> Sent: Tuesday, November 28, 2006 6:39 PM
>> To: email@example.com
>> 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
>> I don't fully understand the battery/gasoline connection and why less
>> battery use equates to improved gas mileage.
>> firstname.lastname@example.org 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
>> >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
>> >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
>> >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
>> >error presented here, because I believe it disparages the real American
>> >car industry, of which I have a number of relatives employed in...
>> >[ mailto:email@example.com ]firstname.lastname@example.org on Saturday,
>> >25, 2006 at 6:08 AM -0500 wrote:
>> >The reason Toyota as a car manufacturer does extremely well in
>> >to the economically protected American car industry is the mere fact
>> >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.
>> >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:email@example.com ]firstname.lastname@example.org -
>> >--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 email@example.com Thu Nov 30 12:40:44 2006