2 Classifications of transducers a transducer is also an energy converting element which converts one form of the measured energy into another form of energy to a predefined accuracy or into the same energy form of other values We also divide transducers into energy-converting and energy-controlling transducers An energy-converting transducer( passive transducer) operates with the energy from the measurand An energy-controlling transducer(active transducer)is powered by external energy source, the energy variations being controlled by the measurand• A transducer is also an energy converting element, which converts one form of the measured energy into another form of energy to a predefined accuracy or into the same energy form of other values. • We also divide transducers into energy-converting and energy-controlling transducers. • An energy-converting transducer ( passive transducer) operates with the energy from the measurand. • An energy-controlling transducer (active transducer) is powered by external energy source, the energy variations being controlled by the measurand. 4.2 Classifications of transducers