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Science project idea on how mechanical energy is changed into electrical energy by the dynamo.
Mechanical to Electrical Energy Science Project Idea
How mechanical energy is changed into electrical energy by the dynamo.In our discussion of oxidation of fuel, the use of water power, etc., we understood that heat energy and mechanical energy may be transformed into electrical energy.This is done by the dynamo, a machine complicated in appearance, which, however, in its simplest form is not difficult to understand. Dynamo 
Simple Principle of Dynamo
You will it recall that in the electric bell a current of electricity passing through the coil of wire, wound around a piece of iron, caused the iron to become a magnet.In generating a current of electricity by a dynamo, the reverse occurs.If a coil of wire is rotated continuously between the poles of a strong magnet, an electric current is produced in the coil of wire.The effect of a magnet in producing an electric current in a coil of wire may be shown by the following experiment
Electrical Energy Science Experiment Move a magnet in and out of a coil of wire, the ends of which are attached to a galvanometer (an instrument for detecting currents of electricity).It will be noted that the current is produced only when the magnet is in motion, and that the direction of the current is in one direction when the magnet is pushed into the coil, and in the opposite direction when it is pulled out. Commutator The essential parts of a dynamo are (1) a rotary coil (armature), (2) a stationary magnet (field magnet), and (3) a sliding contact device for carrying the current from the armature to the external circuit.The efficiency of the dynamo is increased by the use of electromagnets as field magnets.Large dynamos may develop electrical power equal to 8000 or 10,000 horse power.For some purposes an alternating current is satisfactory, but for other purposes a continuous current in one direction is necessary.By means of an attachment called a commutator, the alternating current of the dynamo may be changed to a direct current.
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