Say you had a motor run on a nine volt battery. Would the power from the spinning axis be greater than the amount of power it uses to keep running? How could you test this?
2007-07-23 14:11:08 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
No, the best electric motor convert only 90 to 95% of the electrical power into motion, the rest is lost as heat.
Conversely, using the electric morot as a generator will only convert, at best, 95% of the mechanical power into electricity, the reast again is lost as heat from the self-induction and resistance in the wiring.
How to test it? Well, one way would be to have several identical motors arranged in cascade.
First, the 9 V battery powers one motor which is mechanically linked with a second, identical motor which is then used as a generator. The power from this is used to drive a 3rd motor, linked mechanically to a 4th. And so on. The mere fact that each pair of engine runs progressively slower than the previous one would prove that power is lost along the way.
2007-07-23 14:22:55 · answer #1 · answered by Vincent G 7 · 2⤊ 0⤋
The second law of thermodynamics says it is impossible for a device to generate more energy than it consumes, so any claim to the contrary can simply be dismissed. Any motor will consume more power than it can output.
However, if you really wanted to test it, you could measure the torque and rotational speed of the motor, then multiply the two (along with some constants) to find the power output.
Simultaneously, you would measure the voltage across the motor terminals, and the current flowing through, then multiply these (along with some other constants) to find the power input.
If you perform the experiment accurately, you might find that the motor outputs 97% of the power it consumes, but you will definitely not find it to be 100% or higher.
2007-07-23 14:20:02 · answer #2 · answered by lithiumdeuteride 7 · 1⤊ 0⤋
image electrical energy as water. Volts are the water's rigidity. Amps are the water's quantity. Watts are the water's ability or potential to do something like positioned out a fireplace making use of its volts and amps. Like a water hose with an adjustable nozzle, once you're making the nozzle smaller, the water comes out with extra rigidity (volts). once you're making the nozzle larger, the water comes out with extra quantity (amps). electrical energy is the comparable. severe voltage will arc in the process the air yet except it has some contemporary too, it extremely is possibility loose like static electrical energy. severe contemporary will soften a cord yet devoid of a few voltage it extremely is possibility loose, like your automobile battery. The formulation for figuring ability is P (in watts) = Volts X Amps. A 12 volt battery that places out 5 amps could make 60 watts of ability. Take the battery voltage as much as 24 volts and additionally you will get a hundred and twenty watts of ability. that's why transportable drills with bigger voltage batteries could make extra ability.
2016-11-10 05:23:40 · answer #3 · answered by ? 4 · 0⤊ 0⤋
No. That would violate some basic laws of physics. Plus, electricity would then not cost anything.
2007-07-23 16:36:33 · answer #4 · answered by Rick 2 · 0⤊ 0⤋