Identify the figure and explain its use :[Figure: a rectangular coil placed between the two poles of a magnet; the ends of the coil are taken out through an axle and connected to an ammeter A, forming a closed circuit; arrows show the coil rotating i…

Answer: It is an electric generator (dynamo). It is used to convert mechanical energy into electrical energy.

The figure shows a coil rotating in a magnetic field, with its ends connected to a meter in an external circuit. When the coil turns, the magnetic flux linked with it changes continuously, so an e.m.f. is induced in the coil (electromagnetic induction) and a current flows in the circuit.

Use: a generator is used to produce electricity; in power stations it is driven by steam, water or wind.