Certain sources of electricity (most notably, rotary electro-mechanical generators) naturally produce voltages alternating in polarity, reversing positive and negative over time. Either as a voltage switching polarity or as a current switch...
http://www.allaboutcircuits.com/vol_2/chpt_1/1.html
Title: Principles of Alternating Current Machinery ... Note: second edition, 1921 ... Subject: Electric machinery -- Alternating current...
onlinebooks.library.upenn.edu/webbin/book/lookupid?key=... onlinebooks.library.upenn.edu/webbin/book/lookupid?key=olbp36725
Generators can be sub-divided into two major categories depending on whether the electric current produced is alternating current (AC) or direct current (DC). The basic principle on which both types of generator works is the same, although the details of construction of the two may differ somewhat.
science.jrank.org/pages/2969/Generator.html
Module 3A: Electrical Principles of Alternating Current Circuits and Transformers (Core) ... To understand alternating current and transformers. (COM) ... To understand and calculate alternating current. (NUM)
www.sasked.gov.sk.ca/docs/paa/elec/mod3.html
This interactive Java tutorial explores the principles of alternating current.
java.magnet.fsu.edu/electromag/java/current/ java.magnet.fsu.edu/electromag/java/current/
Explain the principles of magnetism. ... Describe sign waves generated by alternating current. ... Define alternating current.
www.dtae.org/TECHED/standards/courses/elc109.html
Explanation of Alternating Current (AC) Electricity - Succeed in Understanding Physics: School for Champions ... Alternating current (AC) electricity is the type of electricity commonly used in homes and businesses throughout the world. While direct current (DC) electricity flows in one direction through a wire,
www.school-for-champions.com/science/ac.htm
Basic Principles of Eddy Current Inspection ... Eddy currents are created through a process called electromagnetic induction. When alternating current is applied to the conductor, such as copper wire, a magnetic field develops in and around the conductor.
www.ndt-ed.org/EducationResources/CommunityCollege/Eddy... www.ndt-ed.org/EducationResources/CommunityCollege/EddyCurrents/Introduction/IntroductiontoET.htm
The limited scope of this lesson on alternating current does not permit full exploration of the concept, some of the basic principles will be covered.
www.electronicsteacher.com/alternating-current/basic-ac... www.electronicsteacher.com/alternating-current/basic-ac-theory/principles-of-radio.php
Identifier-bib: GLAD-259329 ... Text Archive > American Libraries > Principles of alternating-current machinery ... Principles of alternating-current machinery (1921)
www.archive.org/details/principlesofalte00lawrrich www.archive.org/details/principlesofalte00lawrrich