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Additional
induction coil
English Wikipedia - The Free Encyclopedia
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Induction coil
An
induction coil
or "spark coil" (
archaically
known as an
inductorium
or
Ruhmkorff coil
after
Heinrich Ruhmkorff
) is a type of electrical
transformer
used to produce high-voltage pulses from a low-voltage
direct current
(DC) supply. To create the flux changes necessary to induce voltage in the secondary, the direct current in the primary is repeatedly interrupted by a vibrating mechanical
contact
called an
interrupter
. Developed beginning in 1836 by
Nicholas Callan
,
Charles Page
and others, the induction coil was the first type of transformer. They were widely used in
x-ray machines
,
spark-gap radio transmitter
s,
arc lighting
and quack medical
electrotherapy
devices from the 1880s to the 1920s. Today their only common use is as the
ignition coils
in
internal combustion engines
, and in physics education to demonstrate
induction
.
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