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conventional current.
Current is measured in amperes, with one ampere being the rate of flow of one coulomb per
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
Page 170
second. See coulomb.
current amplifier (electronic circuit). An electronic amplifier in which the current in its output circuit is
greater than the current in its input circuit.
current density. The ratio found by dividing the total amount of current flowing through a conductor, in
amperes, by the cross-sectional area of the conductor, in square inches. Current density is measured in
amperes per square inch.
current electricity. The form of electricity which makes use of the heat and/or the magnetic field produced
when electrons flow in a conductor.
current-fed antenna (radio transmitting antenna). A center-fed radio transmitting antenna that is half a
wavelength long.
current flight plan (ICAO). The flight plan including changes, if any, brought about by subsequent
clearances.
current limiter (generator control component). A device in the control system of a DC generator which
reduces the output voltage or removes the generator from the electrical system any time it produces more
than its rated current.
Some current limiters are a type of slow-blow fuse in the generator output circuit which removes
the generator from the electrical system if its output becomes excessive. Other current limiters reduce the
generator output voltage if it tries to put out more than its rated current.
current-limiting resistor (electrical circuit). A resistor used to limit the maximum amount of current
allowed to flow in a circuit.
A current-limiting resistor is often installed in series with a fuse to limit the maximum amount of
current that can flow before the fuse heats up enough to melt and open the circuit.
current regulator. A device or circuit in the output of an electrical power source that maintains a constant
output current.
If the load demands more current, the regulator raises the output voltage. If the load demands less
current than that for which the regulator is set, the regulator lowers the output voltage.
current transformer. An electrical transformer used for measuring or control purposes. The primary
winding of a current transformer is installed in series with the electrical load, and the voltage produced in
the transformer secondary winding is proportional to the amount of load current.
Curtiss Jenny (Curtiss JN4-D airplane). A World War I training airplane powered by a Curtiss OX-5
engine. It was widely available after the war and helped introduce aviation to the general public.
curvic coupling (turbine engine component). A type of coupling used to join a series of axial-flow
compressor disks or axial turbine wheels to each other.
The coupler consists of a series of radial, gear-like teeth on the faces of two mating flanges.
Curvic couplings provide a positive engagement with no slippage.
cusp. A pointed end.
customer bleed air (gas turbine engine). Air bled from one of the stages of the engine compressor and
used for some function other than the operation of the engine. These functions include pressurization,
deicing, anti-icing, air conditioning, and engine starting.
cutaway drawing (mechanical drawing). A drawing which shows the inside construction or contents of
an object, as well as the outside of the object. A part of the outside of the object is cut away to show the
inside.
cutoff. The point in which a system ceases to operate because a defined cutoff condition has been reached.
Printed from Summit Aviation's Computerized Aviation Reference Library, 2/7/2007
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cutout switch (electrical component). A switch inside a piece of electrical equipment that opens the
circuit when a certain operating condition is reached.
cut threads. Threads that have been formed on a rod by removing part of the metal with a cutting tool. Cut
threads are different from rolled threads, which have been formed on a rod by rolling the rod between
grooved dies.
cutting fluid (machine tool operation). A fluid, often an emulsion of oil and water, poured over a metal
while it is being drilled or turned on a lathe.
Cutting fluid carries away some of the heat caused by friction, lubricates the surface being cut,
prevents rust, and flushes chips away from the cutting edge of the tool.
cutting plane (mechanical drawing). A line on a mechanical drawing used to indicate the location from
which an auxiliary view is made.
cutting speed (machine tools). The speed of the relative motion between a cutting tool and the work being
cut. It is important that the correct cutting speed be used when cutting or drilling metal to get the smoothest
　
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