electricity and allows the flow of charge such metals and alloys

cable or light pipe that carries the message on the light wave

The resulting is known radio when free space the channel

listens for underwater sounds

produced increased version of the input cignal

continuous repeated and alternating waveform

combine or two or more electronic signals

combine an inductor and capacitor

amplifying specific frequencies while attenuating others

destination means

One way or Simplex and simplest way of electronics communication

Home antenna and the television set

No two way communication

full duplex or half duplex

two way communication but the direction alternates

Continuously varying voltage or current

is a single frequency analog signal

do not change continuously but vary discrete increments

It uses morse code

represent numbers letters or special symbols

also know as radio telegraphy

means amplification in a manner that if a signal applied to a circuit

cycles of repetive waves

distance occupied by one cycle

the range of electromagnetic spectrum and radiates to free space