عدد الرسائل : 4366
العمر : 29
الموقع : https://demo.ahlamontada.net/forum.htm
العمل/الترفيه : معيد بكليه العلوم جامعه الاسكندريه
المزاج : nice
جنسيتك : آخر....
السٌّمعَة : 25
تاريخ التسجيل : 22/03/2009
|موضوع: قاموس للمصطلحات الفيزيائيه الخميس يوليو 29, 2010 3:40 pm|| |
بسم الله الرحمن الرحيم
Abbreviation for "ampere" a unit of electrical current
or dissipation of energy as it travels through a medium, Example: radio
waves lose some of their energy as they travel through the atmosphere.
Abbreviation for "Alternating Current"
Trivalent atoms that accept free electrons from pentavalent atoms
Circuit that passes an AC signal while blocking a DC voltage.
Equipment that will operate on either an AC or DC power source.
Device used to transform mechanical energy into AC electrical power.
AC load line
A graph representing all possible combinations of AC output voltage
and current for an amplifier.
AC power supply
Power supply that delivers an AC voltage.
A component that changes the amplitude of a signal between input and output.
A filter that uses an amplifier in addition to reactive components to pass or reject selected frequencies.
The region of BJT operation between saturation and cutoff used for linear amplification.
A voltage in which the polarity alternates.
Abbreviation for "analog to digital converter"
"Y") Measure of how easily AC will flow through a circuit. Admittance
is the reciprocal of impedance and is measured in siemens.
Abbreviation for "audio frequency".
Abbreviation for "automatic frequency control".
Abbreviation for "automatic gain control"
Spring clip on the end of a test lead used to make a temporary connection.
Ratio of collector current to emitter current in a bipolar junction transistor (BJT). Greek letter alpha "a" is the symbol used.
Name for an AC generator.
Abbreviation for "amplitude modulation"
A meter used to measure current.
Unit of electrical current.
A circuit that increases the voltage, current, or power of a signal.
Magnitude or size of a signal voltage or current.
represented as continously varying voltage or current rather than in
discrete levels as opposed to digital data varying between two discrete
anode The positive electrode or terminal of a device. The "P" material of a diode.
A device that converts an electrical wave into an electromagnetic wave that radiates away from the antenna.
A device that converts a radiated electromagnetic wave into an electrical wave.
Power attained in an AC circuit as a product of effective voltage and current which reach their peak at different times.
Discharge of electricity through a gas such as lightning discharging through the atmosphere.
The rotating or moving component of a magnetic circuit.
An oscillator that produces a square wave output from a DC voltage.
The smallest particle that an element can be broken down into and still maintain its unique identity.
The number of positive charges or protons in the nucleus of an atom.
To reduce the amplitude of an action or signal. The opposite of amplification.
A single winding transformer where the output is taken from taps on the winding.
A value of voltage or current where the area of the wave above the value equals the area of the wave below the value.
Abbreviation for "automatic volume control"
Abbreviation for "american wire gauge". A gauge that assigns a number value to the diameter of a wire.
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Condition that occurs when a bridge circuit is adjusted to produce a zero output.
tuned circuit designed to pass a band of frequencies between a lower
cut-off frequency (f1) and a higher cut-off frequency (f2). Frequencies
above and below the pass band are heavily attenuated.
tuned circuit designed to stop frequencies between a lower cut-off
frequency (f1) and a higher cut-off frequency (f2) of the amplifier
while passing all other frequencies.
Width of the band of frequencies between the half power points.
The natural difference of potential that exists across a forward biased pn junction.
The region that lies betwen the emitter and collector of a bipolar junction transistor (BJT).
A method of biasing a BJT in which the bias voltage is supplied to the base by means of a resistor.
A DC voltage source containing two or more cells that convert chemical energy to electrical energy.
A unit of signaling speed equal to the number of signal events per second. Not necessarily the same as bits per second.
(b) The ratio of collector current to base current in a bipolar junction transistor (BJT).
A DC voltage applied to a device to control its operation.
A number system having only two symbols, 0 and 1. A base 2 number system.
bipolar junction transistor
(BJT), A three terminal device in which emitter to collector current is controlled by base current.
multivibrator with two stable states. An external signal is required to
change the output from one state to the other. Also called a latch.
A current drawn continously from a souce. Bleeder current is used to stabilize the output voltage of a source.
A graph of gain versus frequency.
The portion of total current flowing in one path of a parallel circuit.
Voltage at which the breakdown of a dialectric or insulator occurs.
Minimum voltage required to cause a diac to break down and conduct.
A circuit using four diodes to provide full wave rectification. Converts an AC voltage to a pulsating DC voltage.
An amplifier used to isolate a load from a source.
The natural resistance of a "P" type or "N" type semiconductor material.
type of active filter characterized by a constant gain (flat response)
across the midband of the circuit and a 20 dB per decade roll-off rate
for each pole contained in the circuit.
Abbreviation for bandwidth.
A capacitor used to provide an AC ground at some point in a circuit.
Group of eight binary digits or bits.