What device converts one form of signal to another in power engineering?

In power engineering, the transducer plays a crucial role as it is specifically designed to convert one form of signal into another. This can involve changing physical quantities, such as temperature, pressure, or flow, into electrical signals, or vice versa. For example, a transducer may convert pressure readings from a manometer into a voltage signal that can be interpreted by a control system.

Transducers facilitate the monitoring and control of different parameters in various systems by ensuring that the information presented can be easily analyzed and acted upon. Their versatility in adapting various forms of energy transfer and measurement makes them essential components in automation and measurement systems in engineering contexts.

While controllers manage outputs based on inputs and thermocouples function specifically as temperature measuring devices, their functions are more specialized compared to the broader applicability of transducers. A manometer, primarily used for measuring pressure, does not perform signal conversion but rather provides a direct measurement. Thus, the transducer stands out as the correct answer due to its defined purpose in signal transformation.