Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. It does not require a medium of transport. Information is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude or their frequency. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.
Although Nikola Tesla first demonstrated the feasibility of wireless communications in 1893, Guglielmo Marconi, an Italian inventor, was the first to develop workable radio communication. He sent and received his first radio signal in Italy in 1895.
The word 'radio' is used to describe this phenomenon, and radio transmissions are classed as radio frequency emissions.
Although Nikola Tesla first demonstrated the feasibility of wireless communications in 1893, Guglielmo Marconi, an Italian inventor, was the first to develop workable radio communication. He sent and received his first radio signal in Italy in 1895.
The word 'radio' is used to describe this phenomenon, and radio transmissions are classed as radio frequency emissions.
