If a transformer uses two inductors, then it is said to be what kind of transformer?

If a transformer uses two inductors, then it is said to be what kind of transformer?

• A. Isolation transformer
• B. Auto transformer
• C. Potential transformer
• D. Power transformer

Answer: (C)

When a transformer uses two separate windings, it’s a two-winding transformer. The key idea is that each winding is an inductive coil, and the voltage is transformed by magnetic coupling between them. Among two-winding transformers, a device intended to scale down line voltage for measurement or protection is called a potential transformer (also known as a voltage transformer). It provides a known turns ratio to feed meters and relays while keeping galvanic isolation between the high-voltage side and the measurement equipment. An autotransformer uses a single winding with a tap, so it isn’t two inductors. A power transformer is a broad category that can be two-winding or multi-winding and isn’t specific to measurement. Isolation transformers fit the idea of two windings as well but are defined by their primary purpose of isolation rather than measurement, whereas the term “potential transformer” highlights its measurement role.

When a transformer uses two separate windings, it’s a two-winding transformer. The key idea is that each winding is an inductive coil, and the voltage is transformed by magnetic coupling between them. Among two-winding transformers, a device intended to scale down line voltage for measurement or protection is called a potential transformer (also known as a voltage transformer). It provides a known turns ratio to feed meters and relays while keeping galvanic isolation between the high-voltage side and the measurement equipment.

An autotransformer uses a single winding with a tap, so it isn’t two inductors. A power transformer is a broad category that can be two-winding or multi-winding and isn’t specific to measurement. Isolation transformers fit the idea of two windings as well but are defined by their primary purpose of isolation rather than measurement, whereas the term “potential transformer” highlights its measurement role.