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 TM 55-1905-223-24-5
GLOSSARY - CONT
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An instrument for measuring electrical resistance.
PARALLEL OPERATION
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The method by which two or more generators having the same voltage
and frequency characteristics are connected to a common load.
PHASE
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The windings or an ac generator into which a voltage is induced. In a
three-phase system, there are three sets of windings, each set having
a voltage alternating within it exactly one-third of a cycle after the one
ahead of it because of the physical arrangement of the coils.
PITTING
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Corrosion attack in localized areas, resulting in the formation of tiny
cavities.
POLARITY
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An electrical term which indicates the direction in which current flows in
a conductor. In a direct current system, current constantly flows in the
same direction. In an alternating current system, current changes
direction as the polarity of the ac voltage source changes.
RECTIFIER
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A device used to convert alternating current to direct current. A diode
is one of several devices which act as rectifiers.
-
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An electromechanical device having a magnetic coil which, when
energized, opens or closes several sets of contacts.
RESISTANCE
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Opposition to the flow of current.
RESISTOR
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A component which possesses resistance.
RHEOSTAL
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A variable resistor.
RHEOSTAT
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A variable resistor.
ROTOR
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The rotating part of a generator.
SCALE
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Insoluble materials that settle out of cooling water and adhere to the
metallic surfaces; buildup of hard materials which interfere with the
transfer of heat.
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An electromechanical device which, when energized, acts on a
movable core or plunger in the center of the energizing coil to perform
mechanical work.
Glossary 5
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