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History of Electrotechnology
Exam 2
25
Electrical Engineering
Undergraduate 1
11/06/2009

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Term
Anode
Definition
+ plate in liquid battery
Term
James Joule
Definition
known for work w/ heat, electricity & work, the energy unit is named after him
Term
siemens' co demonstrated electric motor train during which event?
Definition
the berlin trade exhibition
Term
electrostatic printer
Definition
1938, Chester Carlson, first of its kind
Term
Assembly Line
Definition
This concept, invented by Henry Ford in the 1920’s, brought efficiency to manufacturing.
Term
pure potassium and sodium
Definition
Humphrey Davy passed current through molten potash and soda to produce these two substances.
Term
Ammeters
Definition
A moving coil, moving iron (magnet), and digital unit are used to measure current.
Term
Skin Effect
Definition
This is known as the restriction of current flow to a very thin region on the surface of a conductor.
Term
Who said it is impossible to start and stop current instantaneously in a coil?
Definition
Joseph Henry
Term
is it impossible to start and stop current instantaneously in a coil?
Definition
yes.
Term
Charles Steinmetz
Definition
first engineer to study the behavior of AC circuits
Term
Tranformers do not work for __
Definition
DC
Term
Transformers work for __
Definition
AC
Term
Ohms
Definition
What resistance is measured in
Term
Induction Motor
Definition
In 1880, the first one of these built by Nikola Tesla was a major factor in the widespread adoption of ac power supplies.
Term
Commutator, armature, stator, and permanent magnet
Definition
this is used to operate a motor and change the direction of the current
Term
Thomas Davenport
Definition
His motor was large enough to operate a drill, lathe, and printing press.
Term
Left Hand Rule
Definition
This indicates the direction of the induced current in motors
Term
Right hand rule
Definition
indicates induced current for Generators
Term
unit of inductance is named after him
Definition
Joseph Henry
Term
William Sturgeon
Definition
He wound a coil of wire around an iron rod and built one of the first electromagnets.
Term
Alessandro Volta
Definition
He discovered the process of electrophorus and the early Chemical Battery
Term
James Clark Maxwell
Definition
Known for the classical Theories of Electrodynamics
Term
Magneto-electric Machines
Definition
These devices converted mechanical energy to electrical energy and were later known as generators.
Term
Power In = Power Out
Definition
transformer
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