A transducer is a device, usually electrical, electronic, electro-mechanical, electromagnetic, photonic, or photovoltaic that converts one type of energy or physical attribute to another for various purposes including measurement or information transfer.
In telecommunication, the term transponder (short-for Transmitter-responder and sometimes abbreviated to XPDR, XPNDR, TPDR or TP) has the following meanings:
* An automatic device that receives, amplifies, and retransmits a signal on a different frequency (see also broadcast translator).
* An automatic device that transmits a predetermined message in response to a predefined received signal.
* A receiver-transmitter that will generate a reply signal upon proper electronic interrogation.
A communications satellite?s channels are called transponders, because each is a separate transceiver or repeater.

Transducer is a device which converts any physical quantity such as temperature,pressure etc into equivalent electric signal.
transponder (short-for Transmitter-responder)is an automatic device that receives, amplifies, and retransmits a signal on a different frequency.example communication,broadcasting satellites.

transducer is a device which converts one form of energy into another form of energy.

transponder is a device which responds to a recieved signal and that response is a predetermined answer for every predetermined recieved signal.

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