13
History of Electricity

History of Electricity

Embed Size (px)

DESCRIPTION

History of Electricity. Thales of Miletus. Greek philosopher, mathematician, and scientist 600 B.C. - amber becomes charged by rubbing The Greek word for amber is elektron . Amber attracted objects when rubbed Believed amber contained a psyche (soul). Jerome Cardan (1501-1576). - PowerPoint PPT Presentation

Citation preview

Page 1: History of Electricity

History of Electricity

Page 2: History of Electricity
Page 3: History of Electricity

Thales of Miletus

• Greek philosopher, mathematician, and scientist

600 B.C. - amber becomes charged by rubbing The Greek word for amber is elektron.

Amber attracted objects when rubbed Believed amber contained a psyche (soul)

CopyCopy

Page 4: History of Electricity

Jerome Cardan (1501-1576)

amber attracts lightweight objects (such as straw, cotton fibers, etc.)

he mineral magnetite attracts only iron.

CopyCopy

Page 5: History of Electricity

William Gilbert (1540-1603) • Queen Elizabeth I's doctor named electricity for the Greek word elektron for amber

if two non-metal rods were rubbed briskly, they behaved similarly to amber called those materials electrics (materials that

we call insulators today) Believed some type of fluid was

responsible for this action (FLUID MODEL)

CopyCopy

Page 6: History of Electricity

Fluid model of electricity

one-fluid model of electricity a physical transfer of the single fluid

occurred when an object became electrically charged, leaving one surface with 'negative' charge and one with 'positive' charge

CopyCopy

Page 7: History of Electricity

Otto von Guericke (1602-1686)

von Guericke invented a another machine for producing static electricity.

• It consisted of a ball of sulfur that was hand-rotated by a crank.

• A piece of wood held against this sphere would produce a large spark.

Eventually evolved into: Van de Graaf generator

CopyCopy

Page 8: History of Electricity

Charles DuFay (1730's) charged pieces of glass repelled other glass-like

materials, but attracted substances similar to amber.

• two kinds of electricity must exist. He called these vitreous ("glassy") and resinous (amber-like).

DuFay had discovered negative and positive electric charge, although he thought they were actually two types of electric "fluid." (TWO FLUID MODEL)

CopyCopy

Page 9: History of Electricity

two-fluid model of electricity

Two fluids exist like fluids repelled, unlike attracted

CopyCopy

Page 10: History of Electricity

Pieter van Musschenbroek

invented the Leyden Jar, which stores electric charge

CopyCopy

Page 11: History of Electricity

Benjamin Franklin (1706-1790)

The theory in Franklin's time was that electricity was some kind of fluid

objects had too much fluid, they would repel each other

but they would attract objects with too little fluid

object with an excess of fluid touched an object with too little fluid, then the fluid would be shared.

CopyCopy

Page 12: History of Electricity

Benjamin Franklin (1706-1790)

Franklin used the term positive for what he thought was an excess of electric fluid

negative for a deficiency of fluid.

CopyCopy

Page 13: History of Electricity

Models change over Time

Science is an ever changing discipline With each new bit of information new

models have to be introduced to explain the new phenomenon

CopyCopy