A device that converts one form of input signal to another form of output signal is called a ------

The term that accurately describes a device which converts one form of input signal to another form of output signal is "transducer." Transducers are essential components in instrumentation that enable the transformation of energy from one form to another. For example, a temperature sensor (such as a thermocouple) can convert thermal energy into an electrical signal. This conversion process is crucial for instrumentation systems as it allows for the measurement and control of various physical parameters.

Converters, while similar, typically refer to devices specifically designed to change one type of electrical signal into another, not necessarily encompassing other forms of energy. Detectors are primarily used to sense the presence of a signal or a physical quantity but do not necessarily convert it to a different form. Transmitters, on the other hand, are devices that send signals over distances; they may contain transducers but do not inherently perform the conversion function on their own. Thus, "transducer" is the most appropriate term for the device described in the question.