Conversion of electrical energy into mechanical energy

Principle

In the first part of the experiment, the qualitative observation of the energy conversion process is of primary interest. It is a common everyday occurrence to see a motor lifting a load. The distinctive feature of this setup is, that the directly subsequent "falling down" of the load regenerates electrical energy, as it can be seen by the lighting up of a lamp.
In the second part of the experiment, the efficiency of the electric motor is to be determined. This setup has the advantage, that potential energy is that form of mechanical energy which can be most simply calculated.

Task

How can electrical energy be converted into mechanical energy?

Observe the lifting of a weight by an electric motor and the conversion of mechanical energy into electrical energy by a generator. Then determine the efficiency of an electric motor when lifting a weight.

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