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A dynamo converts mechanical motion of a driven wheel into electrical motion, with the aid of a magnet. A dynamo has a number of magnets all with insulated wires. Their iron cores point towards the centre of a circle like the spokes of a wheel; and their curved inner faces form a circle in which a spool, wound with wire, is spun by the water wheel. An electric motor on the other hand converts electrical energy into mechanical energy. To do this, a motor needs a special kind of magnet known as an electromagnet. In its simplest form, this consists of an iron bar wrapped in a coil of wire. If someone passes an electric current through the wire, a magnetic field is formed in the iron bar, and it becomes a magnet, with definite north and south poles. If the current is turned off the magnetic properties will disappear.