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BASIC ELECTRICITY UNIT 3-a

Horizontales
A unit of energy. One Btu will raise the temperature of one pound of potable water 1°F.
Electricity produced by heating two dissimilar metals at the junction of the metals. Such a device is known as a thermocouple.
Electricity from light.
Certain materials that develop a potential difference between two faces of a crystal when it is mechanically distorted by pressure.
A device consisting of two wires or strips of dissimilar materials that are joined together at one end (the hot junction). When this hot junction is heated, the thermocouple produces a DC voltage across the other two ends (cold junction).
A device whose resistance varies with temperature to such a degree that it can be used as a control element.
A chemical cell source of DC electricity that converts chemical energy into electrical energy. It uses different electrode materials than a wet cell and a paste-type electrolyte rather than a liquid one.
A source of DC electricity that converts chemical energy into electrical energy.
Verticales
Certain materials that develop a potential difference between two faces of a crystal when it is mechanically distorted by pressure.
A lamp consisting of a glass bulb filled with neon and two or more insulated electrodes. When the neon is ionized by a potential difference, current flows through the neon, creating a red glow. Used to check for the presence of voltages in circuits (above firing potential of 50 to 60 volts).
A power system, also known as a PV system that supplies solar power.
A lamp consisting of a tube filled with a vapor with electrodes at either end of the tube. When a given potential is imposed across the electrodes the release of free electrons from the electrodes causes a current flow to take place through the vapor. The vapor emits invisible ultraviolet light, which, in turn, causes a fluorescent material coating on the tube to emit visible light.
A number of thermocouples connected in series to produce a higher voltage than a single thermocouple.