![]() ![]() The arrows indicate the direction of the lines of magnetic force. Two-dimensional representation of the magnetic field around a bar magnet. ![]() The filings align themselves along the lines of magnetic force surrounding the magnet. This can be ‘seen’ in two dimensions if iron filings are sprinkled on a sheet of paper placed over the magnet. Magnets are also surrounded by a similar three-dimensional field. ![]() When an electric current flows through a wire, it generates a three-dimensional magnetic force field around the wire, similar to that surrounding a bar magnet. Although it will only be powerful enough to light a small torch bulb, it works on the same basic principles as the power station generators that supply domestic electricity. Here, we describe how to use readily available materials to make a simple generator. A generator is simply a device that converts mechanical energy (itself derived from coal, oil, natural gas, wind, water, nuclear reactions or other sources) into electrical energy. ![]()
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