What is a typical feature of devices such as isolation transformers?

Isolation transformers are designed specifically to decouple different sections of an electrical system, which effectively isolates ground loops and prevents interference from noise or surges that can disrupt signal integrity. This characteristic makes them particularly valuable in audio and video applications, where maintaining a clear and stable signal is critical.

Ground loops often occur when there are multiple grounding points in a system, leading to variations in potential that can introduce hums or noise into the audio or video signals. By utilizing an isolation transformer, these ground paths can be severed, allowing for cleaner transmissions through the equipment.

The other features mentioned, such as amplifying signals, filtering out noise, or switching voltages, are not typical functions of isolation transformers. Amplification is usually the role of amplifiers, while noise filtering may involve different types of filters designed for that purpose. Switching voltages pertain to devices like relays or switches, which manage the flow of electrical currents in a different manner. Thus, the correct understanding of an isolation transformer's role emphasizes its capacity to eliminate interference caused by ground loops.