Which type of transformer has a ratio of 1:2?

A transformer with a ratio of 1:2 is classified as a step-up transformer. This type of transformer increases voltage from the primary winding to the secondary winding. In this case, the primary side has one volt for every two volts on the secondary side, effectively amplifying the voltage while proportionally reducing the current based on the principle of conservation of energy.

Step-up transformers are used in various applications where voltage needs to be increased for transmission over long distances, thereby reducing energy losses during transmission. Unlike step-down transformers, which decrease voltage and increase current to supply power at lower voltages, the step-up transformer focuses on enhancing the voltage level, making it suitable for high-voltage transmission lines.

Isolation transformers, on the other hand, are designed mainly to isolate different parts of a system for safety and noise reduction without specifically increasing or decreasing voltage levels. Similarly, balun transformers are used to convert between balanced and unbalanced signals and can serve specific functions in audio and RF applications but do not inherently serve to alter the voltage level in a significant way like step-up and step-down transformers do.