telecommunication pioneers day 3. benjamin franklin b 1747 leydn jar was the first capacitor b 1752...
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Benjamin FranklinBenjamin Franklin
1747 Leydn jar 1747 Leydn jar was was the first capacitorthe first capacitor
1752 discovers that 1752 discovers that electricity has a electricity has a positive and a positive and a negative charge negative charge
1752 flew a kite to 1752 flew a kite to demonstrate demonstrate electricity and electricity and lightening relatedlightening related
Luigi Galvani Luigi Galvani
1737-1798, Italian1737-1798, Italian 1780 noticed frog’s 1780 noticed frog’s
leg jumpleg jump effects of effects of
electrostatic stimuli electrostatic stimuli applied to the applied to the muscle fiber of frogs muscle fiber of frogs
““animal electricity”animal electricity” Inspired VoltaInspired Volta
Count Alessandro Count Alessandro Giuseppe Antonio Giuseppe Antonio Anastasio Volta Anastasio Volta
(1745 - 1827) (1745 - 1827) ItalianItalian
1775 created the 1775 created the electrophoruselectrophorus
1800 created the 1800 created the voltaic pilevoltaic pile
Volt named after Volt named after himhim
Hans Christian ØrstedHans Christian Ørsted
1777 - 1851, 1777 - 1851, DanishDanish
1820 a magnetic 1820 a magnetic needle is deflected needle is deflected at right angles to at right angles to a wire carrying an a wire carrying an electric currentelectric current
electromagnetic electromagnetic induction induction
André AmpèreAndré Ampère
(1775-1836), French(1775-1836), French combined theory of combined theory of
magnetism and elec-magnetism and elec-tricity in early 1820'stricity in early 1820's
electrical current electrical current creates magnetic creates magnetic fieldsfields
system to measure system to measure current flow called current flow called amperesamperes
Georg Simon Ohm Georg Simon Ohm
1787-1854, German1787-1854, German describes relation-describes relation-
ship between ship between current flow, current flow, voltage, and voltage, and resistance resistance
Ohm’s LawOhm’s Law Resistance measureResistance measure
Joseph Henry Joseph Henry
(1797-1878), (1797-1878), AmericanAmerican
discovered electro-discovered electro-magnetic induction magnetic induction
discovered self-discovered self-inductanceinductance
Inductance Inductance measure is the measure is the HenryHenry
Michael Faraday Michael Faraday
(1791-1867), British (1791-1867), British foremost foremost
experimental experimental scientist of his day scientist of his day
discovery of electro-discovery of electro-magnetic induction magnetic induction
the induction of one the induction of one electric current by electric current by anotheranother
James Clerk MaxwellJames Clerk Maxwell
(1831-1879), British (1831-1879), British mathematical basis mathematical basis
for electricity and for electricity and electromagnetismelectromagnetism
propagation of propagation of electromagnetic electromagnetic waveswaves
light is made up of light is made up of electromagnetic electromagnetic waves.waves.
Heinrich Rudolph Hertz Heinrich Rudolph Hertz
(1857-94), German(1857-94), German demonstrates the demonstrates the
pro-duction and pro-duction and detection of detection of Maxwell's wavesMaxwell's waves
photoelectric effect photoelectric effect Frequency in HertzFrequency in Hertz
Thomas Alva EdisonThomas Alva Edison
(1847 - 1931), (1847 - 1931), AmericanAmerican
1887 creates the 1887 creates the carbon carbon microphone microphone
Guglielmo MarconiGuglielmo Marconi (1874-1937), Italian(1874-1937), Italian Father of WirelessFather of Wireless 1894 Began work 1894 Began work
following Hertzfollowing Hertz 1895 short range 1895 short range
radioradio 1899 Britain to 1899 Britain to
FranceFrance 1901 Britain to 1901 Britain to
CanadaCanada
Nathan B. Stubblefield Nathan B. Stubblefield
(1860-1928), US(1860-1928), US 1892 invents “wireless telephone”1892 invents “wireless telephone” first person to transmit human first person to transmit human
voice without wiresvoice without wires demonstrates system officially May demonstrates system officially May
30, 1902 in Philadelphia30, 1902 in Philadelphia
Reginald A. FessendenReginald A. Fessenden
(1866-1932), born (1866-1932), born in Canada of US in Canada of US parentsparents
designs a high-designs a high-frequency frequency alternator for alternator for continuos signalcontinuos signal
1906 Christmas Eve 1906 Christmas Eve First broadcast of First broadcast of speech & musicspeech & music
Lee De ForestLee De Forest (1873-1961) US(1873-1961) US 1906 Invents the 1906 Invents the
“audion” now called “audion” now called a triode. Types of a triode. Types of vacuum tube.vacuum tube.
key component in key component in nearly all radio, nearly all radio, radar, TV, and radar, TV, and computers until computers until transistorstransistors
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