Signals A gesture, action, or sound that is used to convey information or instructions, typically by prearrangement between the parties concerned. What is Amplitude??? T he maximum difference of an alternating electric current or potential from the average value. What is Frequancy??? Frequency is the number of occurrences of a repeating event per unit of time . T he rate per second of a vibration constituting a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light). ...