Electromagnetism (Longman Physics Topics) by J.M. Osborne, T.H. McArthur

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Supply, then 2+ volts output will be produced, sufficient to light a 2+ volt lamp which will not light at 1 volt. Such a transformer is a step-up transformer. The left-hand coil is called the primary and the right-hand one the secondary. A stepdown transformer will have fewer turns in the secondary than in the primary, and the output voltage is then less than the input voltage. The usual electrical symbol for a transformer is shown on the left, the primary and secondary coils and the iron core being symbolically represented.

50 [COMMUNICATION TAPE RECORDING A very convenient way of storing information is to use a tape recorder. Like the previous devices, this also uses the principles of electromagnetism. The tape is usually several hundred feet of plastic material impregnated on one side with a very fine magnetic powder. This powder can be magnetised, de-magnetised and re-magnetised like any other magnet such as a piece of steel. Illustrated below is the record/play-back head of a tape recorder passing over the impregnated tape.

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