Explanation of how an AC transformer works. Also refer to
physical science, Alternating Current, DC, direct current,
magnetism, voltage, electromagnet, house current, high voltages,
School for Champions. Copyright © Restrictions Alternating
Current (AC) Transformers by Ron Kurtus (revised 29 April 2012)
A transformer is an electrical device that is used to change the
voltage in alternating current (AC) electrical circuits. The
ability of this device to change voltage is a major advantage of
AC electricity over direct current (DC). A simple transformer
consists of a dual electromagnet, where there are two sets of
wires wrapped around it for the input and output voltages. The
electromagnet may be in the form of a straight iron rod,
horseshoe, or donut shaped. The output voltage is a function of
the input voltage and the ratio of the number of turns of the
wire. Uses for transformers are to decrease the line voltage to
house voltage and the change the voltage for small devices.
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