- Industry: 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 instrument used to measure the reactive power in an alternating current circuit. Reactive power is the power caused by the portion of the current not in phase with the voltage. Reactive power is measured in volt-amps reactive (VARs) or kilovolt-amps reactive (KVARs).
Industry:Aviation
An electrical instrument used to measure the strength of the electromagnetic field radiated from a radio transmitting antenna.
Industry:Aviation
An electrical load that does not have any inductance. Its opposition to current is caused by resistance and/or capacitance.
Industry:Aviation
An electrical load that is not continuously applied to the circuit. The landing gear retraction motor and the flap operating motor are both intermittent loads in that neither of them are operated continuously.
Industry:Aviation
An electrical load that produces more capacitive reactance than inductive reactance in the circuit. Current leads the voltage in a capacitive load.
Industry:Aviation
An electrical machine that converts low-voltage DC into high-voltage DC.
The dynamotor has two armatures on its single rotating shaft, and these armatures turn inside of two sets of field coils. One set of field coils and one armature is for a low-voltage DC motor, and the other set of field coils and armature are for a high-voltage DC generator. A dynamotor is also called a rotary converter.
Industry:Aviation
An electrical machine that converts mechanical energy into DC electricity. A conductor is moved through a magnetic field, and the mechanical energy used to move the conductor is changed into electrical energy.
Almost all generators of this type produce alternating current, and some type of rectifier is used to change the AC into DC before it leaves the generator.
Industry:Aviation
An electrical measuring circuit that uses three known resistances (R1, R2, and R3) and one unknown resistance (R4). The bridge is balanced (R1 : R2 = R3 : R4) when no current flows through the indicator.
Industry:Aviation
An electrical measuring instrument that displays, on the face of a cathode-ray tube, the way an electrical value changes with time. A high-velocity beam of electrons strikes a phosphorescent coating on the inside of the cathode-ray tube face and produces a visible glow. The beam is swept from side to side by a time-controlled oscillator and deflected up and down by the electrical value being measured.
Industry:Aviation
An electrical measuring instrument that measures current and voltage at the same time and displays the results as electrical power. The instrument pointer moves over the dial an amount proportional to the product of the current and the voltage.
The current being measured flows through two series current coils and produces a fixed electromagnetic field whose strength is proportional to the amount of current. The voltage being measured forces current to flow through a movable voltage coil and produces a magnetic field proportional to the amount of voltage.
The pointer, mounted on the movable coil, is restrained by two calibrated hairsprings. The amount of its rotation is proportional to the strength of the two magnetic fields, and this makes the movement of the pointer proportional to the amount of power being measured.
Industry:Aviation
