Posted by John T on April 26, 2011 at 11:33:42 from (173.243.189.183):
In Reply to: OT electrical ?? posted by teddy52food on April 26, 2011 at 10:53:20:
Teddy, your really into this energy stuff, sorry I havent read yet what you e mailed me. Take these facts into account, then you can answer your own basic question, and YES you're correct (if amps pass through a circuit from a source to a load) in as far as:
If you supply energy (Volts x Amps x Time) with say a generator or the utility or whatever into a load and then measure the energy (Volts x Amps x Time) the load dissipates (or the HP a motor produces), you would get the same EXCEPT FOR THE ENERGY USED/WASTED AS HEAT IN THE TRANSFER IN THE CONDUCTORS (The I Squared R losses) plus some of the energy produced by the load (say a motor) is also wasted as heat and not all goes to the motors HP output. Im unsure of a motors exact efficiency but would guess maybe 75% goes to HP and 25% to heat/friction losses???
Since copper wire is NOT a perfect conductor (it has some albeit small resistance) when you pass current through it, a voltage drop (V = IR) occurs across it and yes current flow through a resisistor produces heat.
Sooooooo the energy into that circuit is NOT destroyed ONLY CHANGED IN FORM, the majority goes to the load while some is converted to heat (I Squared R) during transmission through imperfect conductors STILL ALL THE ENERGY IN = ALL THE ENERGY OUT, its just some goes to the motors HP,,,,,,some to heat in the motor,,,,,some to heat in the conductors.
Likewise and even if you Teddy dont believe this, the laws of Physics and Thermodynamics tell us (which I as an engineer choose to believe) its not posible for a machine to produce more energy then one supplies to it. If say a motor had perfect frictionless bearings and its windings were zero resistance and there were no other friction/heat losses, it will produce almost as much energy as supplied to it but Im unaware of any such motor or any device that can produce more energy then you put into it.
Yall take care now, I gotta check my DC Motor in the shop, I have it running off a battery and turning an alternator (which is charging the battery) and I'm afraid the battery may become overcharged YIKES
Ol John T and all
Lifes not really that short, its just that youre dead for such a long time...
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