What is a key feature of step-up transformers?

A key feature of step-up transformers is that they are designed to increase voltage. This is achieved by having more turns in the secondary coil than the primary coil. When alternating current (AC) flows through the primary winding, it creates a magnetic field that induces a voltage in the secondary winding. The ratio of the number of turns in the primary and secondary coils determines the voltage transformation. Specifically, in a step-up transformer, the secondary coil's higher number of turns results in a higher voltage than what is supplied to the primary coil.

This functionality is fundamental in various applications where higher voltages are required for efficient transmission over long distances, such as in power distribution systems. In contrast, step-up transformers are not used to decrease voltage, which eliminates the possibility for options that suggest a reduction in input voltage. Similarly, they are not primarily intended for low-power applications, as their main purpose is to enable high-voltage scenarios.