Modulating Signal,
electrical signal
microphone............
A fiber optical signal is based on the transfer of photons, while an electrical signal is based on the transfer of electrons.
A microphone is an acoustic-to-electric transduceror sensor that converts sound into an electrical signal.
hi
A transducer is any device that either converts an external signal to an equivalent electronic signal or converts an electronic signal to an equivalent external signal.
no........
transitor
This is an electronic device which converts electrical signal into a digital signal.
Twisted pair wiring is a digital signal.Coaxial cable is an analog signal.
A signal. It is a telegram.
Signal is the electrical(discussion is confined to electrical domain only) quantity which varies between two levels and holds some useful information.