Posted on 02/21/2008 7:27:30 AM PST by george76
440 is also 33% more voltage than 300 volts.
I like alternative fuels and hybrids and all that stuff, but it's only a matter of time before electric cars erupt into a shower of sparks and blue high voltage arcs in a traffic collision or a hydrogen car blows up like a MOAB in downtown traffic or a fueling station.
... Or some anarchist posts on the Internet about how a hydrogen car can be booby-trapped and turned into a demolition device.
1 horsepower = 746 watts, so a battery system capable of delivering 100 hp would need to be able to deliver 74,600 watts. That's a hell of a lot of juice
300 volts from a battery source could very well kill you if you grab the two terminals with either hand.
The amount of current necessary to cause heart fibrillation varies according to the frequency. Obviously, this is DC.
At 60Hz, you’re “can’t let go” threshold will be somewhere between about 6 and 15 ma. Above about 50ma at 60Hz, taken across your cardiac region, above 50VAC, and you could be dead.
For DC, humans are able to withstand currents between 5 and 10X what they can at 60Hz AC. So your “can’t let go” threshold for DC will be about 50 to 150ma, and you’re likely going to see heart problems at about 250+ ma. (a quarter amp).
Whether or not you could draw 250ma from hand to hand would depend, as you say, on how damp your hands are, how saline your sweat is, etc. But it certainly would be a roll of the dice and it would be very traumatic if you survived a hit from 300VDC.
And remember — batteries are able to dump huge currents into a load for short periods of time. So for someone chopping into a car with a set of jaws — it could vaporize the jaws when you hit the power cables.
A voltage supply at 300VDC would have my full and undivided attention to safety.
People are regularly killed by common 120 v house current. 300v will definitely kill you. Also, the energy expended by a voltage V going through a fixed resistance R, goes as the SQUARE of the voltage: E= V^2 * R
Maybe those guys should go over to Chysler. As of the 10/07 strike, the base pay for a line worker is $26/hour, which is about $52k (plus benefits and extra pay for seniority).
You can see why there is such animosity between the UAW and the automakers. Can you imagine making such a pittance in a job that requires no pre-existing skills or education, and in which your employer trains you at their cost each time the nature of the job changes, plus you get more pay just for being there, even though your seniority offers your employer little benefit over a new worker. Why, its practically slavery. ...end sarcasm.
Yeah, that’ll give you a reall buzz!
No, it's the volts. Static electricity not withstanding.
There is one thing that doesn’t sit well with me though, the charging time. Where as with gasoline you could fill up in 5 minutes, how many hours would it take to charge?
Here is your choice:
Save the environment -then- kill it later, or just kill it now and get it over with.
These ecos also forget that electric cars need electrical production ( nuclear, coal, hydro dams...)
and transmission lines...
More inconvenient truths.
The hybrid:
I’m going to invent a machine which will sell because it will be marketed as earth-friendly (A very contemporary theme), with 450 pounds of batteries on board, made internationally by the lowest bidder with parts shipped all over the planet but selling for as much as $9,000 ABOVE the cost of a conventional comparable car.
This car will not allow people to do much themselves. You will come to me for your service because the sealed power units, warranties in place, electronics, proprietary tooling required; basically makes it near impossible for you to do anything. Maintenance, which over the lifespan of a vehicle is a large share of the total cost will come to the dealer and manufacturer, not off brand manufacturers, “Bob the car mechanic,” or even you if you choose to do some simple maintenence yourself.
This car will be nearly disposable with a very predictable life span. Buy one of those and a timed future sale is ensured. No more of those persistent dorks that keep their cars 20 years and put 250,000 plus miles on them. You shouldn’t do that anyhow, “save the planet and buy a new car!”
The earth friendly disposable car: the perfect product for idiots seeking to consume environmentalism, and 450 pounds of batteries.
E=voltage in volts, P=power in watts, I=current in amps, and R=resistance in ohms. Your formula E=V2R is is incorrect, because E is Electromotive force expressed in Volts, not "energy."
Ohm's law:
P=IE
E=IR
subsituting IR from the second formula for E in the first formula:
P=I(IR) or:
P=I2R
So power is the square of current times resistance. If we instead solve the second formula for current, we get:
I=E/R
Substituting E/R for I in the first formula we get:
P=(E/R)E or:
P=E2/R
Power is voltage squared divided by R.
“I killed my computer speakers a couple days ago with a static zap........No, I’m not the supervillain Electro”
Your speakers might be fine......your sound card, on the other hand......
No power to the speakers......I replaced them with identical new ones which then worked. Now before I even touch my keyboard I try to discharge my static by touching my desk lamp........or my cat's nose.
>>But Al Gore says we should count all the volts.
sometimes I think you may be dangerously clever...
lol. Iterate.
So after a Greenie gets smashed by an 18 wheeler he has to worry about getting The Chair!
Sounds about right.
Pray for W and Our Troops
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