posted on Dec, 8 2012 @ 05:55 AM
Originally posted by EdSurly
reply to post by happykat39
Exactly...so where was I wrong? Anyway, the reason's you cite is exactly the reason that we will start to see higher
voltage automobile electrical systems in the near future. 42 volt electrical systems will be the norm in the near future (the next 3-5 years). Auto
manufacturers will see a large savings in wire/copper costs on their new cars. More voltage, less current = the same wattage to run accessories but
less copper is needed because of the lessened amperage load = more cost savings for the manufacturers.
Look at the following quoted statement from the reply in question and then I will explain.
Okay if you believe that can you tell me the gauge wire you have on your battery terminals and the length of them. I would say the
wires to your batttery are rated for around 5000 watts and you are saying you can put 12000 through them?
Your error was in saying that a wire was rated in watts. In fact, there is no theoretical limit to the wattage that can be transmitted over a wire,
any wire, any size. There is only one absolute limit on the electrical capacity of a wire and that is the current, or amperage, that it can carry
without overheating and melting.
While in actual practice the voltage we can apply to a wire is limited by our ability to insulate it from ground, in theory there is no such limit.
That means that we could, if we could properly insulate it, apply infinite voltage to any wire. Since wattage is the product of amperage times voltage
that means that any wire that is carrying a current, even if only a small fraction of an amp, is capable of transmitting infinite wattage (infinity
times anything is still infinity). The only limit to this is
OUR ABILITY to insulate the wire sufficiently to prevent arcing to ground. A nit
to pick,yes; but technically an important nit.
And just one final note for the alpha geeks among us, and yes I am one...
There are different levels of infinity. They are not differentiated by their final result which is always infinity but rather by their approach curve
to infinity. If you are graphing a formula that includes infinity as one of the axes the curve of the graph, or more accurately the slope at any given
point along the graph, will be different for different values being input for the starting point of the graph. However the slope will soon become so
close to the same for any input as the plot nears infinity that it would become difficult, if not impossible, to express it mathematically, but it
would still exist until infinity is reached at which point the slope itself becomes infinite.