slip ring

noun Electricity.
a metal ring, usually of copper or cast iron, mounted so that current may be conducted through stationary brushes into or out of a rotating member.

Origin:
1895–1900

slip-ring, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slip ring
 
n
electrical engineering a metal ring, mounted on but insulated from a rotating shaft of a motor or generator, by means of which current can be led through stationary brushes into or out of a winding on the shaft

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The power management system and slip ring will require room for growth.
Power is supplied to the carousel through a slip ring arrangement underneath the carousel, allowing for continuous rotation.
Since the transducer rotated with the wheel, connections were enabled using a slip ring.
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