Which device converts AC to AC?

Which device converts AC to AC?

• A. Rectifier
• B. Inverter
• C. Converter
• D. Transformer

Answer: (D)

AC to AC conversion means changing the voltage level of an alternating current without turning it into direct current. A transformer does this by magnetic coupling between two coils: when AC flows in the primary winding, it creates a changing magnetic field that induces AC in the secondary winding. The voltage level can be stepped up or stepped down, and the frequency and waveform of the AC remain essentially the same, just at a different amplitude. Rectifiers convert AC to DC, and inverters convert DC to AC, so they don’t perform AC-to-AC conversion in the same sense. The term converter is broad and not specific to AC-to-AC in standard terminology. Therefore, the device that converts AC to AC is the transformer.

AC to AC conversion means changing the voltage level of an alternating current without turning it into direct current. A transformer does this by magnetic coupling between two coils: when AC flows in the primary winding, it creates a changing magnetic field that induces AC in the secondary winding. The voltage level can be stepped up or stepped down, and the frequency and waveform of the AC remain essentially the same, just at a different amplitude. Rectifiers convert AC to DC, and inverters convert DC to AC, so they don’t perform AC-to-AC conversion in the same sense. The term converter is broad and not specific to AC-to-AC in standard terminology. Therefore, the device that converts AC to AC is the transformer.