Cathode | Wikipedia audio article
Channel: wikipedia tts
Date: 27/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Cathode


00:00:42 1 Charge flow
00:03:17 2 Etymology
00:06:26 3 In chemistry
00:07:56 3.1 Electrolytic cell
00:08:31 3.2 Galvanic cell
00:08:53 3.3 Electroplating metal cathode (electrolysis)
00:09:19 4 In electronics
00:09:29 4.1 Vacuum tubes
00:11:24 4.1.1 Hot cathode
00:15:01 4.1.2 Cold cathode
00:16:10 4.2 Diodes



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SUMMARY
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A cathode is the electrode from which a conventional current leaves a polarized electrical device. This definition can be recalled by using the mnemonic CCD for Cathode Current Departs. A conventional current describes the direction in which positive charges move.  Electrons have a negative electrical charge, so the movement of electrons is opposite to that of the conventional current flow. Consequently, the mnemonic cathode current departs also means that electrons flow into the device's cathode from the external circuit.
The electrode through which conventional current flows the other way, into the device, is termed an anode.