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Radio: A Form Of Communication
Beginning of Essay
Mr. Zambizi
Physics
Radio is a form of communication in which intelligence is transmitted without
wires from one point to another by means of electromagnetic waves. Early forms
of communication over great distances were the telephone and the telegraph. They
requi .... Middle of Essay
.... as Michael Faraday and Joseph Henry. They had individually developed
the theory that a current flowing in one wire could induce (produce) a current
in another wire that was not physically connected to the first.
Hans Christian Oersted had shown in 1820 that a current flowing in a wire sets
up a magnetic field around the wire. If the current is made to change and, in
particular, made to alternate (flow back and forth), the building up and
collapsing of the associated magnetic field induces a current in another
conductor placed in this changing magnetic field. This principle of
electromagnetic induction is well known in the application of tra ....
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Words: 3073 - Pages: 12
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