Question

Electric motor question

Answer 1

can some one explain to me : "electricity as an input and mechanical energy as an output"

Answer 2

I'm not quite sure what you are asking here.

Most of Physics is about the conversion of energy from one form to another.

When you power an electric motor you connect it to a source of electrical energy, be it a battery, or a mains supply.

This is the 'input of energy' into the system (the motor)

The motor turns and generally is used to lift or move an object or to turn it.

Thus the object connected to the motor has more energy in the form of speed (kinetic enrgy) or height (potential energy) or rotational kinetic energy. These are all forms of 'mechanical' energy.

Thus you input electrical energy and the output is the mechanical energy.

(note that a motor also produces heat energy, which is generally 'wasted' and contributes to the inefficiency of the motor)