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autotransformer

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Definitions of autotransformer in various dictionaries:

An electrical transformer in which the primary and secondary coils have some or all windings in common.

AUTOTRANSFORMER - An Auto-transformer (sometimes called auto-step down transformer) is an electrical transformer with only one winding. The "auto" (Greek for "self") p...

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Possible Dictionary Clues
An electrical transformer in which the primary and secondary coils have some or all windings in common.
An electrical transformer which has a single winding of which part is common to both primary and secondary circuits.

Autotransformer description
An Auto-transformer (sometimes called auto-step down transformer) is an electrical transformer with only one winding. The "auto" (Greek for "self") prefix refers to the single coil acting alone and not to any kind of automatic mechanism. In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer. In contrast, an ordinary transformer has separate primary and secondary windings which are not electrically connected. * The winding has at least three taps where electrical connections are made. Since part of the winding does "double duty", autotransformers have the advantages of often being smaller, lighter, and cheaper than typical dual-winding transformers, but the disadvantage of not providing electrical isolation between primary and secondary circuits. Other advantages of autotransformers include lower leakage reactance, lower losses, lower excitation current, and increased VA rating for a given size and mass.Autotransformers are often used to step up or step down voltages in the 110-115-120 V range and voltages in the 220-230-240 V range - for example, providing 110 V or 120 V (with taps) from 230 V input, allowing equipment designed for 100 or 120 V to be used with a 230 V supply. This allows US electrical equipment to be fed from the higher voltages used in Europe and elsewhere. Autotransformers can also be used to supply 230 V appliances from a 100 to 120 V supply within the US. In all cases the supply and the autotransformer must be correctly rated to supply the required power.

Autotransformer description

An Auto-transformer (sometimes called auto-step down transformer) is an electrical transformer with only one winding. The "auto" (Greek for "self") prefix refers to the single coil acting alone and not to any kind of automatic mechanism. In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer. In contrast, an ordinary transformer has separate primary and secondary windings which are not electrically connected.
* The winding has at least three taps where electrical connections are made. Since part of the winding does "double duty", autotransformers have the advantages of often being smaller, lighter, and cheaper than typical dual-winding transformers, but the disadvantage of not providing electrical isolation between primary and secondary circuits. Other advantages of autotransformers include lower leakage reactance, lower losses, lower excitation current, and increased VA rating for a given size and mass.Autotransformers are often used to step up or step down voltages in the 110-115-120 V range and voltages in the 220-230-240 V range - for example, providing 110 V or 120 V (with taps) from 230 V input, allowing equipment designed for 100 or 120 V to be used with a 230 V supply. This allows US electrical equipment to be fed from the higher voltages used in Europe and elsewhere. Autotransformers can also be used to supply 230 V appliances from a 100 to 120 V supply within the US. In all cases the supply and the autotransformer must be correctly rated to supply the required power.

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