THE RADIO

THE RADIO:

Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequendy, pulse width... When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.

Guglielmo Marconi, who was a a electrical engineer, invented the radio in 1830.

And here there are some images as the radio evolved  (before and  after):

Before                                                After