CAMRT Radiography Practice Exam

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What type of current do autotransformers require for operation?

  1. DC current

  2. AC current

  3. Both AC and DC current

  4. None of the above

The correct answer is: AC current

Autotransformers require alternating current (AC) for operation due to their design and function. They operate on the principle of electromagnetic induction, which relies on a changing magnetic field to transfer energy between windings. This changing magnetic field is produced by AC, as direct current (DC) does not create a varying magnetic field. As a result, autotransformers are used in applications like voltage regulation and power distribution, where the ability to adjust voltage levels while maintaining efficiency is essential. Therefore, the correct answer identifies the necessity of AC current for the efficient operation of autotransformers.

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