How is energy conserved in an electric motor?
PHYSICS - CLASS 10
ANSWER IT ITS VERY URGENT
Answers
Answer:
The reason you can't do that is as follows, which really doesn't have anything directly to do with energy conservation.
We apply a voltage to the wire, which pushes current through it which then produces a magnetic field that acts against the magnetic field produced by the permanent magnet, then that reaction force acts on the wire, causing it to rotate.
But as the moving wire cuts through the field lines produced by the permanent magnets, another voltage (called an electromotive force or EMF) is induced in the wire which opposes the voltage we are applying to wire. The faster the wire is moving, the greater this "back EMF" becomes. When the back EMF equals the source voltage, the current through the wire goes to zero (in the ideal case) and the motor can revolve no faster.
This back EMF effect prevents us from being able to make a perpetual motion machine out of an electric motor, because it acts to cancel the flow of current even in the case of a perfectly-conducting wire.
Answer:
1. Understand the energy usage:
electricelectric motors are energy conversion devices they convert electrical energy into rotational energy and some heat it is important to understand the difference between motor speed rotational speed and motor load.