Electricity and magnetism are very closely linked. When electricity fl ows through a wire a magnetic current is formed. when a wire is moved through a magnetic field an electric current is formed. This concept can be used to create an electromagnet. these can be useful as they can act as a magnet that can be turned on and off. to increase the strength of an electromagnet you can either add more coils of wire, use a higher current or add an iron core. Electromagnets can be used in electronic security bolts as well as electric bells.
This video gives a good overview of the electromagnetic spectrum.
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