auto-transformer

auto-transformer

An engineer adjusts the settings on an auto-transformer in the laboratory.

Definition
  1. Noun:
    • Electrical device: An "auto-transformer" is a type of electrical transformer in which a single winding serves as both the primary and secondary coil, with a common tap point that provides a variable voltage output. It is used to step up or step down voltage levels efficiently, often in applications requiring small adjustments to voltage.
Usage Examples
  • Noun:
    • The auto-transformer is commonly used in power distribution systems to regulate voltage. (An electrical device that adjusts voltage levels.)
    • Technicians installed an auto-transformer to reduce the voltage from 240V to 120V for the equipment. (A device for stepping down voltage.)
Advanced Usage

  • "Auto-transformer starting": A method of starting electric motors by using an auto-transformer to reduce the initial voltage, thereby lowering the starting current.

    • The factory uses auto-transformer starting for its large induction motors to prevent electrical surges. (A technique for smooth motor startup.)

  • "Variable auto-transformer": Also known as a variac, this is a type of auto-transformer with a movable tap that allows continuous adjustment of the output voltage.

    • The laboratory uses a variable auto-transformer to supply precise voltage levels for experiments. (A device with adjustable output.)
Variants and Related Words

  • Autotransformer (n): An alternative spelling of "auto-transformer," often used interchangeably.

    • The autotransformer is more compact than a conventional transformer. (A synonym for auto-transformer.)

  • Transformer (n): A broader term for any device that transfers electrical energy between circuits through electromagnetic induction.

    • A standard transformer has separate primary and secondary windings, unlike an auto-transformer. (A related electrical component.)
Synonyms
  • Voltage regulator: A device that maintains a constant voltage level.
  • Variac: A specific brand name for a variable auto-transformer, often used generically.
Related Idioms
  • "Step up": To increase voltage or power.
    • The auto-transformer can step up the voltage from 110V to 220V. (To raise voltage.)
  • "Step down": To decrease voltage or power.
    • The auto-transformer steps down the voltage for safe use in household appliances. (To lower voltage.)