What is difference between analog signal and alternating current?

Answer 1

An analog or analogue signal is any continuous signal for which the time varying feature of the signal is a representation in respect to other time varying quantity, i.e., analogous to another time varying signal.

Any information may be conveyed by an analog signal often such a signal is a measured response to changes in physical phenomena, such as sound, light, temperature, position, or pressure, and is achieved using a transducer.

So, Analog signal is a medium to send information over distance ,the information cane be anything. The main disadvantage of Analog signals is they have larger noise .

Alternating Current is defined as the behavior of Electric charge. Alternating Current is the movement of Electric current which is periodic and attains both positive and reverse direction (positive and negative) in its propagation whereas Direct Current only attains itself in one direction i.e positive cycle only.

So,the difference is...Analog is the type of signals whereas Alternating is a behavior of Electric charge on its movement.

Answer 2

Radio frequency waves are alternating currents. Many people assume that alternating current means only household supplies. Not so. The only difference between the two is the frequency : 50 or 60 Hz for house supply, anything from 16 KHz up to 100 MHZ for radio.