Why 28V DC?

S Narayan wrote:

"Tiffani" wrote in message ...


Jim Weir wrote:

So why was there 12 volts to begin with? Because Detroit started making
cars
with a much higher compression ratio and to turn the starters over, the
old 6
volt batteries weren't cutting it. Bingo. Two 6 volters in series
gives 12
volts and that was close enough for Detroit gummint work.

Actually the auto industry is moving to a 42 volt system in the future to
handle
increasing electrical requirements, plus more accessories (e.g. oil pump)
may be
electric in the future. Where can you find more information on this?
Why
http://www.42volt.org of course.


A 42V DC? shock could be pretty bad.

Not really. Touching a spark plug could feel pretty bad. Touching 42 volts
might give you a bzzz! However you wouldn't normally become part of the
circuit, anymore than you would with your domestic 120 volts or your telephone
(about 53 volts on hook, maybe double while ringing). Remember even if you did
get a shock, it's DC not AC. AC is worse for shocks because it can cause the
muscles to hold on to the conductor. DC tends to do the opposite. And it is
the amps that are most damaging to humans, not the volts.

Lisa Hughes wrote:

Not really. Touching a spark plug could feel pretty bad.

Spark plugs run on extremely high voltage. The 12v battery power is fed through
a step-up tranformer (known as a "coil" on most systems) to increase the voltage.
Voltage at the plug will be anywhere from 40,000 to 100,000 volts.

http://www.howstuffworks.com/ignition-system2.htm

George Patterson
Great discoveries are not announced with "Eureka!". What's usually said is
"Hummmmm... That's interesting...."

x-no-archive: yes

"G.R. Patterson III" wrote:

Lisa Hughes wrote:

Not really. Touching a spark plug could feel pretty bad.

Spark plugs run on extremely high voltage. The 12v battery power is fed through
a step-up tranformer (known as a "coil" on most systems) to increase the voltage.
Voltage at the plug will be anywhere from 40,000 to 100,000 volts.

Uh, yes. That's why I said it could feel pretty bad and juxtaposed it with the
relatively harmless 42 volts. BTW: that spark plug can knock you into last week, but
it has very few amperage and will not likely cause you any long term harm (unless you
bang your head as you back away fast