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Transformers and Power Distribution

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Transformers are essential for the economical distribution of ac electrical power. The ready transformation of ac from low voltage to high and back led to the wide acceptance of ac over dc for power distribution near the turn of the century. These pages from another course tell most of the story...

From SCEN103 pages:
Electrical Power Consumption
Introduction to Transformers
Electrical Power Distribution
Slideshow of Circuit Overloading
Review of Electrical Safety
Electric Power Companies

A transformer is a device having a pair of windings, the primary side and the secondary side, which are flux-linked by a common core.

Transformation of Voltage:

[voltage transformation]

Transformers may also be used to transform impedances; e.g. coupling the output of a stereo amplifier (Rout ~ 1 kohm) to a speaker of 4 or 8 ohm impedance for maximum power transfer. Refer to pg. 831 of HRW and 33-90P for impedance matching applications.

Transformation of Resistance:

[resistance transformation]

Note: My comments about Edison vs. Tesla/Westinghouse regarding the "Battle of the Currents" were drawn primarily from the book "Edison, The Man Who Made The Future" by Ronald W. Clark (Putnam, 1977).

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Last updated Dec. 17, 1997.
Copyright George Watson, Univ. of Delaware, 1997.