Telecommunication Pioneers Day 3. Benjamin Franklin b 1747 Leydn jar was the first capacitor b 1752 discovers that electricity has a positive and a negative.

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Presentation transcript:

Telecommunication Pioneers Day 3

Benjamin Franklin b 1747 Leydn jar was the first capacitor b 1752 discovers that electricity has a positive and a negative charge b 1752 flew a kite to demonstrate electricity and lightening related

Luigi Galvani b , Italian b 1780 noticed frog’s leg jump b effects of electrostatic stimuli applied to the muscle fiber of frogs b “animal electricity” b Inspired Volta

Count Alessandro Giuseppe Antonio Anastasio Volta b ( ) Italian b 1775 created the electrophorus b 1800 created the voltaic pile b Volt named after him

Hans Christian Ørsted b , Danish b 1820 a magnetic needle is deflected at right angles to a wire carrying an electric current b electromagnetic induction

André Ampère b ( ), French b combined theory of magnetism and electricity in early 1820's b electrical current creates magnetic fields b system to measure current flow called amperes

Georg Simon Ohm  , German b describes relation- ship between current flow, voltage, and resistance b Ohm’s Law b Resistance measure

Joseph Henry  ( ), American b discovered electromagnetic induction b discovered self- inductance b Inductance measure is the Henry

Michael Faraday b ( ), British b foremost experimental scientist of his day b discovery of electromagnetic induction b the induction of one electric current by another

James Clerk Maxwell b ( ), British b mathematical basis for electricity and electromagnetism b propagation of electromagnetic waves b light is made up of electromagnetic waves.

Heinrich Rudolph Hertz  ( ), German b demonstrates the production and detection of Maxwell's waves b photoelectric effect b Frequency in Hertz

Thomas Alva Edison b ( ), American b 1887 creates the carbon microphone

Guglielmo Marconi b ( ), Italian b Father of Wireless b 1894 Began work following Hertz b 1895 short range radio b 1899 Britain to France b 1901 Britain to Canada

Nathan B. Stubblefield b ( ), US b 1892 invents “wireless telephone” b first person to transmit human voice without wires b demonstrates system officially May 30, 1902 in Philadelphia

Reginald A. Fessenden b ( ), born in Canada of US parents b designs a high- frequency alternator for continuos signal b 1906 Christmas Eve First broadcast of speech & music

Lee De Forest b ( ) US b 1906 Invents the “audion” now called a triode. Types of vacuum tube. b key component in nearly all radio, radar, TV, and computers until transistors