Happy 200th Birthday - Electric Motor

| No Comments

Changed civilization. From IEEE Spectrum:

200 Years Ago, Faraday Invented the Electric Motor
In 1820, the Danish physicist Hans Christian Ørsted threw electromagnetic theory into a state of confusion. Natural philosophers of the day believed that electricity and magnetism were two distinct phenomena, but Ørsted suggested that the flow of electricity through a wire created a magnetic field around it. The French physicist André-Marie Ampère saw a demonstration of Ørsted's experiment in which an electric current deflected a magnetic needle, and he then developed a mathematical theory to explain the relationship.

English scientist Michael Faraday soon entered the fray, when Richard Phillips, editor of the Annals of Philosophy, asked him to write a historical account of electromagnetism, a field that was only about two years old and clearly in a state of flux.

A bit more backstory and then this:

On 3 September 1821, Faraday observed the circular rotation of a wire as it was attracted and repelled by magnetic poles. He sketched in his notebook a clockwise rotation around the south pole of the magnet, and the reverse around the north pole. "Very satisfactory," he wrote in his entry on the day's experiment, "but make more sensible apparatus."

The next day, he got it right. He took a deep glass vessel, secured a magnet upright in it with some wax, and then filled the vessel with mercury until the magnetic pole was just above the surface. He floated a stiff wire in the mercury and connected the apparatus to a battery. When a current ran through the circuit, it generated a circular magnetic field around the wire. As the current in the wire interacted with the permanent magnet fixed to the bottom of the dish, the wire rotated clockwise. On the other side of the apparatus, the wire was fixed and the magnet was allowed to move freely, which it did in a circle around the wire.

Of course, I am a big Nikola Tesla fan and we must not overlook his patents from 1988 for the first Practical electric motor. Some primitive direct current motors were built in the 1830's but Tesla was the first person to develop alternating current (single and polyphase current) motors.  These are the first practical substitute for steam.  The foundation of the Industrial Revolution.

Leave a comment

September 2021

Sun Mon Tue Wed Thu Fri Sat
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30    

Environment and Climate
AccuWeather
Cliff Mass Weather Blog
Climate Depot
Ice Age Now
ICECAP
Jennifer Marohasy
Solar Cycle 24
Space Weather
Watts Up With That?


Science and Medicine
Junk Science
Life in the Fast Lane
Luboš Motl
Medgadget
Next Big Future
PhysOrg.com


Geek Stuff
Ars Technica
Boing Boing
Don Lancaster's Guru's Lair
Evil Mad Scientist Laboratories
FAIL Blog
Hack a Day
Kevin Kelly - Cool Tools
Neatorama
Slashdot: News for nerds
The Register
The Daily WTF


Comics
Achewood
The Argyle Sweater
Chip Bok
Broadside Cartoons
Day by Day
Dilbert
Medium Large
Michael Ramirez
Prickly City
Tundra
User Friendly
Vexarr
What The Duck
Wondermark
xkcd


NO WAI! WTF?¿?¿
Awkward Family Photos
Cake Wrecks
Not Always Right
Sober in a Nightclub
You Drive What?


Business and Economics
The Austrian Economists
Carpe Diem
Coyote Blog


Photography and Art
Digital Photography Review
DIYPhotography
James Gurney
Joe McNally's Blog
PetaPixel
photo.net
Shorpy
Strobist
The Online Photographer


Blogrolling
A Western Heart
AMCGLTD.COM
American Digest
The AnarchAngel
Anti-Idiotarian Rottweiler
Babalu Blog
Belmont Club
Bayou Renaissance Man
Classical Values
Cobb
Cold Fury
David Limbaugh
Defense Technology
Doug Ross @ Journal
Grouchy Old Cripple
Instapundit
iowahawk
Irons in the Fire
James Lileks
Lowering the Bar
Maggie's Farm
Marginal Revolution
Michael J. Totten
Mostly Cajun
Neanderpundit
neo-neocon
Power Line
ProfessorBainbridge.com
Questions and Observations
Rachel Lucas
Roger L. Simon
Samizdata.net
Sense of Events
Sound Politics
The Strata-Sphere
The Smallest Minority
The Volokh Conspiracy
Tim Blair
Velociworld
Weasel Zippers
WILLisms.com
Wizbang


Gone but not Forgotten...
A Coyote at the Dog Show
Bad Eagle
Steven DenBeste
democrats give conservatives indigestion
Allah
BigPictureSmallOffice
Cox and Forkum
The Diplomad
Priorities & Frivolities
Gut Rumbles
Mean Mr. Mustard 2.0
MegaPundit
Masamune
Neptunus Lex
Other Side of Kim
Publicola
Ramblings' Journal
Sgt. Stryker
shining full plate and a good broadsword
A Physicist's Perspective
The Daily Demarche
Wayne's Online Newsletter

About this Entry

This page contains a single entry by DaveH published on September 3, 2021 3:26 PM.

Heh - soul food... was the previous entry in this blog.

Eviction and homebreaking is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.

Monthly Archives

Pages

OpenID accepted here Learn more about OpenID
Powered by Movable Type 5.2.9