Ground loop (electricity) | Wikipedia audio article
Channel: wikipedia tts
Date: 21/01/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Ground_loop_(electricity)


00:00:50 1 Description
00:03:16 2 Representative circuit
00:07:26 3 Common ground loops
00:08:16 3.1 Ground currents on signal cables
00:12:01 3.2 Sources of ground current
00:14:14 3.3 Solutions
00:17:44 3.4 Balanced lines
00:18:40 4 History
00:19:36 5 In low frequency audio and instrumentation systems
00:22:24 5.1 Isolation
00:23:10 5.2 Balanced interconnection
00:25:07 6 In analog video systems
00:26:38 7 In digital and RF systems
00:30:08 8 Internal ground loops in equipment
00:31:35 9 In circuit design
00:33:40 10 See also



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SUMMARY
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In an electrical system, a ground loop or earth loop occurs when two points of a circuit both intended to be at ground reference potential have a potential between them. This can be caused, for example, in a signal circuit referenced to ground, if enough current is flowing in the ground to cause two points to be at different potentials.
Ground loops are a major cause of noise, hum, and interference in audio, video, and computer systems.  Wiring practices that protect against ground loops include ensuring that all vulnerable signal circuits are referenced to one point as ground.  The use of differential connections can provide rejections of ground-induced interference.  Removal of safety ground connections to equipment in an effort to eliminate ground loops also eliminates the protection the safety ground connection is intended to provide.