electroacoustic transducer. A device that changes either variations in sound pressure into variations of electrical pressure (voltage), or variations in voltage into variations of sound pressure. Microphones and speakers are both examples of electroacoustic transducers.
electrochemical series. A list of metals arranged according to their electrode potential. Metals highest in the list give up electrons to all metals below them. When corrosion occurs, the metal highest in the series will be the one that is corroded, or eaten away.
The electrochemical series is also known as the electromotive series.
1.
Magnesium
2.
Zinc
3.
Cadmium
4.
7075-T6 aluminum alloy
5.
2024-T3 aluminum alloy
6.
Mild steel
7.
Lead
8.
Tin
9.
Copper
10.
Stainless steel
11.
Silver
12.
Nickel
13.
Chromium
14.
Gold
electrochemistry. The aspects of chemistry that deal with electron potentials within the different chemical elements.
electrode. A conductor, or part of an electrical component through which electrons flow to or from an external circuit. The carbon rod and zinc can are electrodes in a carbon-zinc battery. The emitter, base, and collector are the electrodes in a bipolar transistor.
electrode potential. A voltage existing within an alloy of metals or in any type of electrochemical cell. The electrode potential is caused by chemical differences of the materials involved, and it causes electrons to flow within the material any time there is a conductive path between the different materials.
electrodynamic damping (electrical meter damping). The decreasing amplitude of pointer oscillation of an electrical meter, caused by the generation of a voltage in the moving coil as it oscillates back and forth in the field of a permanent magnet. Energy used to produce current in the moving coil decreases the energy causing the oscillations.
electrodynamics. The aspect of electricity that deals with electrons in motion. This includes the effects of magnetism and induction. The other aspect of electricity is electrostatics, which deals with electrical charges caused by electrons that are stationary.
electrogalvanizing. The process of electrolytically depositing a layer of zinc on sheets of steel.
electroluminescence. The emission of light caused by the application of a strong electrical field to certain materials. It is not caused by the heating effect of the electricity.
electrolysis. The process in which the chemical composition of a material is changed by passing electrical current through it. When DC electricity passes through water, the water breaks down into its two chemical constituents, hydrogen and oxygen. Hydrogen bubbles form on the negative electrode, and oxygen bubbles form on the positive electrode.
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