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In electric systems, a metal housing containing two or more devices (such as fuses) for protection against excessive current in circuits which supply portable electric appliances.
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Related Terms |
OCEAN THERMAL-ENERGY CONVERSION
The conversion of energy arising from the temperature difference between warm surface water of oceans and cold deep-ocean current into electrical energy or other useful forms of energy. Abbreviated OTEC.
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NULL-BALANCE RECORDER
An instrument in which a motor-driven slide wire in a measuring circuit is continuously adjusted so that the voltage or current to be measured will be balanced against the voltage or current from this circuit; a pen linked to the slide wire makes a graphical record of its position as a function of time.
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NO-LOAD CURRENT
The current which flows in a network when the output is open-circuited.
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NERNST-LINDEMANN CALORIMETER
A calorimeter for measuring specific heats at low temperatures, in which the heat reservoir consists of a metal of high thermal conductivity such as copper, to promote rapid temperature equalization; none of the material under study is more than a few millimeters from a metal surface, and the whole apparatus is placed in an evacuated vessel and heated by current through a platinum heating coil.
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MULTIPLICATION
An increase in current flow through a semiconductor because of increased carrier activity.
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MULTICHANNEL FIELD-EFFECT TRANSISTOR
A field-effect transistor in which appropriate voltages are applied to the gate to control the space within the current flow channels.
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MOVING-CONDUCTOR LOUDSPEAKER
[ENG ACOUS] A loudspeaker in which the mechanical forces result from reactions between a steady magnetic field and the magnetic field produced by current flow through a moving conductor.
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MOVING-COIL GALVANOMETER
Any galvanometer, such as the d'Arsonval galvanometer, in which the current to be measured is sent through a coil suspended or pivoted in a fixed magnetic field, and the current is determined by measuring the resulting motion of the coil.
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MOS-CONTROLLED THYRISTOR
A type of thyristor in which there is a very thin metal oxide semiconductor (MOS) integrated circuit in the top surface of the high-power thyristor components, so that only a small gate current is needed.
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MILLISECOND DELAY CAP
A delay cap with an extremely short (20500 thousandths of a second) interval between passing of current and explosion. Also known as short-delay detonator.
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