أكاديميا - كولنز - معاجم الجيب العلمية - الفيزياء - انكليزي - فرنسي - عربي الحرف ٣_ a

Academia - Collins - Pocket Scientific Dictionaries - Physics - English - French - Arabic - Letter 3_ A


ammeter
ampèremètre m

Ampere scale. A device used to measure current. current . The most common types of meters are moving coil meters and moving iron. In fact, in all cases we measure the effect (effect) of the current and not the current itself (the rate of charge flow). It is possible to make highly sensitive meters and moving coils that respond to small changes in current. If these are equipped with a rectifier, they measure both alternating current and direct current. These scales have a regular scale. As for ampere meters with a moving arm of the repulsive type, they are not highly sensitive or accurate, and they do not have a regular scale. However, it is simple and robust and measures both alternating and direct current.

ampere
ampère f

Ampere. The unit used to measure electric current is electric current


amplifier
amplifier

Amplifier. An electronic circuit for a signal whose output has the same format as the input but has a larger amplitude. The output/input amplitude ratio is the gain. Half of the performance of these circuits comes from gain and freedom from distortion and frequency range upon design. A simple valve or transistor can amplify, but better output results from more complex current circuits. The drawing below shows a simple transistor amplification circuit.

Real amplifiers only work with a variable input. DC amplifiers vary in processing, and can amplify small constant currents. An operational amplifier is an integrated circuit commonly used in computer hardware. There are two types of operational amplifier, the first is called the inverting amplifier, and the other is called the non-inverting amplifier.


amplitude
amplitude f

capacity. Measure the magnitude of the vibration, and then measure its energy. Thus, in the case of a simple pendulum, the amplitude is the distance between the central position and the position of one of the extreme ends. The amplitude in the case of a sound wave is the pressure difference between the average and maximum values. The amplitude is the maximum displacement of the measurement in question.

time
capacity
Offset

The amplitude of a wave is related to its intensity, or strength.

AND gate
circuit m ET

Gate and . See logic gates.

aneroid barometer
Baromètre m anéroïde

Aneroid barometer. "aneroid" means "without liquid", compared to a mercury barometer. When air pressure changes, a spring-loaded metal box changes shape, and a system of levers transmits the current changes to an indicator.

Aneroid barometer movement


anode
anode f

Anode to the positive terminal of a direct current source, or any positive lead connected to it. Compare with cathode.


antinode
antinœud m

stomach . See node.


approximation
approximation f

Approximation. An approximate or slightly accurate value.
It is often used when working with approximate values ​​and not with high precision values.