IS it possible to hook up a car battery to an eletric motor. Have the electric motor drive the alternator by belt, and have the alternator charge the battery and never have the battery go dead? if not explain why?
car battery, eletric motor, and an alternator
- Thread starter sonoma1993
- Start date
No, it is not possible because of loss. In other words, every one of the actions you have listed causes some energy to be wasted in the process. The wasted energy needs to be replaced. Otherwise, your system will eventually stop turning. How long it will spin before it stops has to do with how efficient your system is.
Edit:
If you touch an electric motor while it is working, you will notice that it is warm. That is because some energy is converted to heat. That is wasted energy. The same thing happens in an alternator. The same thing happens to a battery that is being used. They all generate heat. That heat is energy lost.
There are many designs in literature that are supposed to run with no need to energy. None of them work forever. They eventually stop because of energy loss.
http://www.phact.org/e/dennis4.html
http://burtleburtle.net/bob/physics/whythere.html
http://www.kilty.com/pmotion.htm
http://en.wikipedia.org/wiki/Perpetual_motion_machine
Neither the alternator nor the generator are 100% effective, and then there's wire resistance, loss of charge in the battery, mechanical friction etc. etc.
Read up on "perpetuum mobile" and why it's impossible to build one.
In fact, the best way to preserve a battery's charge is to leave it alone.
Read up on "perpetuum mobile" and why it's impossible to build one.
In fact, the best way to preserve a battery's charge is to leave it alone.
heres one for yas , try a battery 12 v ,plug it into an inverter up to 240 v , then plug it into a Tesla coil [A SMALL ONE ! ], feed some power back to the battery from the coil [circuit board needed ], and use the excess voltage for lights etc ....
TRY IT !
TRY IT !
Technicaly your "alternator" is a generator because it produces DC power. Alternators produce AC power.
Now I just have a dead 12v battery.No, technicaly (most) car "alternators" are "alternators" because they generate AC power.
They use rectifier diodes to convert their AC power back into DC for the battery. This allows them to generate almost 12v DC even at idle.
AnthraX101
They generate around 14 volts actually, and it's nowhere near DC. It's the sum of three 120 degree offset, diode rectified AC phases.
And what's the sum of three 120 degree offset AC phases with a full-wave rectifier? Roughly DC power.
It may be dirty, but it's still close enough to DC to be modeled that way. And you're right, car alternators should generate over 12v at peak, most of the time somewhere between 13.6-14.8v, but freqently won't do all of that at idle.AnthraX101
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