- 업종: Aviation
- Number of terms: 16387
- Number of blossaries: 0
- Company Profile:
Aviation Supplies & Academics, Inc. (ASA) develops and markets aviation supplies, software, and books for pilots, flight instructors, flight engineers, airline professionals, air traffic controllers, flight attendants, aviation technicians and enthusiasts. Established in 1947, ASA also provides ...
An electrical transformer with a turns ratio between its coils that matches the impedance of the load to the impedance of the source of electrical power.
The impedance of the primary winding of the transformer is the same as the output impedance of the source, and the impedance of its secondary winding is the same as the impedance of the load. The maximum amount of power can be transferred in an electrical circuit when the impedance of the source matches the impedance of the load.
Industry:Aviation
An electrically driven centrifugal pump mounted in the bottom of the fuel tanks in large aircraft.
Boost pumps are used to provide a positive flow of fuel under pressure to the engine for starting and to serve as an emergency backup in the event the engine-driven pump should fail. They are also used to transfer fuel from one tank to another and to pump fuel overboard when it is being dumped.
Boost pumps maintain pressure on the fuel in the line to the engine-driven pump to prevent a vapor lock forming in these lines.
Centrifugal boost pumps have a small agitator propeller on top of the pump impeller. This agitator causes the vapors in the fuel to be released before the fuel leaves the tank.
Industry:Aviation
An electrically operated fuel pump used to supply fuel to the engine for starting or in the case of failure of the engine-driven pump.
Industry:Aviation
An electrically operated relay or solenoid that must be de-energized (the power to its operating coil must be turned off) at intervals to keep the coil from overheating. Starter relays and relays used to operate motors that run for only a short period of time can be intermittent-duty relays. Intermittent-duty relays cannot be used as master battery relays or light relays that must be energized for long periods of time.
Industry:Aviation
An electrically operated switch. One switch contact is mounted on a movable steel arm, the armature, which is held away from the fixed contact by a spring. When current flows through the electromagnetic coil of the relay, it pulls the armature down and causes the movable contact to press tightly against the fixed contact, closing the switch.
Relays are used to remotely control a large amount of current by using a small amount of control current flowing through the relay coil. Relays are being replaced in many types of electrical equipment with solid-state components that do the same job, but have no moving parts.
Industry:Aviation
An electrically operated, hand-held jigsaw. A saber saw uses a short, stiff blade, motor driven in a reciprocating (in-and-out) fashion.
Industry:Aviation
An electrochemical cell that changes chemical energy into electrical energy. A primary cell cannot be recharged, and it must be replaced when it becomes discharged. A carbon-zinc battery, such as used in a flashlight, is an example of a primary cell.
Industry:Aviation
An electrochemical cell that changes chemical energy into electrical energy. The cell is made of a zinc can filled with a paste of ammonium chloride. A carbon rod is supported by the ammonium chloride in such a way that it cannot touch the zinc can.
Electrical energy is produced as electrons leave the zinc can and travel through an external circuit to the carbon rod. A carbon-zinc cell has an open-circuit voltage of approximately 1.5 volts.
Industry:Aviation
An electrochemical device, normally made of a number of individual cells. Electrical energy is stored in a battery by changing it into chemical energy.
Chemical energy in the battery causes a potential difference between the negative and the positive terminals, and when a conductor joins the two terminals, electrons flow from the negative terminal to the positive terminal.
Industry:Aviation
An electrode in an electron tube that releases electrons when exposed to light. Photocathodes are used in television cameras to convert light energy into electrical energy.
Industry:Aviation
