Electric current | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Electric current


00:00:54 1 Symbol
00:01:32 2 Conventions
00:02:55 2.1 Reference direction
00:04:01 3 Ohm's law
00:04:53 4 Alternating and direct current
00:06:10 5 Occurrences
00:07:15 6 Current measurement
00:07:43 7 Resistive heating
00:08:46 8 Electromagnetism
00:08:55 8.1 Electromagnet
00:10:04 8.2 Radio waves
00:10:25 9 Conduction mechanisms in various media
00:12:00 9.1 Metals
00:14:40 9.2 Electrolytes
00:15:37 9.3 Gases and plasmas
00:17:11 9.4 Vacuum
00:18:40 9.5 Superconductivity
00:19:32 9.6 Semiconductor
00:22:21 10 Current density and Ohm's law
00:27:04 11 Drift speed



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SUMMARY
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An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionised gas (plasma).The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second. Electric current is measured using a device called an ammeter.Electric currents cause Joule heating, which creates light in incandescent light bulbs. They also create magnetic fields, which are used in motors, inductors and generators.
The moving charged particles in an electric current are called charge carriers.  In metals, one or more electrons from each atom are loosely bound to the atom, and can move freely about within the metal. These conduction electrons are the charge carriers in metal conductors.