| Meaning | An electrical device by which alternating current of one voltage is changed to another voltage. |
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| Parts | induction coil | A coil for producing a high voltage from a low-voltage source |
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| primary coil, primary winding, primary | coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit |
| secondary coil, secondary winding, secondary | coil such that current is induced in it by passing a current through the primary coil |
| Narrower | Tesla coil | A step-up transformer with an air core |
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| coil | A transformer that supplies high voltage to spark plugs in a gasoline engine |
| step-down transformer | A transformer that reduces voltage |
| step-up transformer | A transformer that increases voltage |
| voltage regulator | A transformer whose voltage ratio of transformation can be adjusted |
| Broader | electrical device | A device that produces or is powered by electricity |
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| Spanish | transformador, trasformador |
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| Catalan | transformador |
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| Verbs | transform | increase or decrease (an alternating current or voltage) |
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