Which transformer increases voltage from primary to secondary?

Which transformer increases voltage from primary to secondary?

• A. Isolation
• B. Step-Up
• C. Step-Down
• D. Core

Answer: (B)

Voltage changes in a transformer come from the turns ratio between the primary and secondary windings. If the secondary has more turns than the primary, the induced voltage on the secondary is higher, so the transformer increases voltage—known as a step-up transformer. This is why it’s the correct choice. A step-down transformer would have fewer secondary turns and reduce voltage, an isolation transformer aims for a 1:1 ratio to provide electrical isolation without changing voltage, and the core is just the magnetic path and doesn’t by itself change the voltage.

Voltage changes in a transformer come from the turns ratio between the primary and secondary windings. If the secondary has more turns than the primary, the induced voltage on the secondary is higher, so the transformer increases voltage—known as a step-up transformer. This is why it’s the correct choice. A step-down transformer would have fewer secondary turns and reduce voltage, an isolation transformer aims for a 1:1 ratio to provide electrical isolation without changing voltage, and the core is just the magnetic path and doesn’t by itself change the voltage.