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Chapter 4
Terms
4
Communication
Not Applicable
10/05/2011
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Term
Telegraph
 Definition
invented in the 1840s, it sent electrical impulses through a cable from a transmitter to a reception point, transmitting Morse code.
Term
Morse Code
 Definition
a system of sending electrical impulses from a transmitter through a cable to a reception point; developed by the American inventor Samuel Morse.
Term
Electromagnetic Waves
 Definition
invisible electronic impulses similar to visible light; electricity, magnetism, light, broadcast signals, and heat are part of such waves, which radiate in space at the speed of light, about 186,000 miles per second.
Term
Radio Waves
 Definition
a portion of the electromagnetic wave spectrum that was harnessed so that signals could be sent from a transmission point and obtained at a reception point.
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