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1、 电气英语证书考试(PEC)-Glossary and Definitions of Basic Electrical and electronics Terms A (amp)- Ampere AC/DC-Alternating current or direct current ADC -Analog-to-digital converter AFT -Automatic fine tuning AFC -Automatic flow controller, used in
2、 controlling the flow of gasses under pressure into a vacuum system AGC-Automatic gain control AM/FM -Amplitude modulation or Frequency modulation AMM -Analog multimeter antilog - Antilogarithm Ap -Power gain Apc-Automatic phase control Av -Voltage gain AVC -Automatic volume contro
3、l AWG -American wire gauge AC- Alternating current A/D-Analog to digital AF-Audio frequency AFC -Automatic frequency control Ah -Ampere hour AM-Amplitude modulation Ai -Current gain c -Centi (10-2) C -Capacitance or capacitor CAD -Computer aided design CAM -Computer aided manuf
4、acture CATV -Cable TV CB -Common base configuration CB- Citizen's band CC -Common collector CE-Common emitter cm –Centimeter cmil -Circular mil CPU- Central processing unit C (Q)-Coulomb CR cr -Junction diode CRO-
5、Cathode ray Oscilloscope CRT -Cathode ray tube CT -Total capacitance cw -Continuous transmission E DC- or Erms Difference in potential e -Instantaneous difference in potential ECG- Electrocardiogram ECL -Emitter coupled logic EHF- Extremely high frequency EHV- Ex
6、tra high voltage ELF- Extremely low frequency EMF-Electromotive force EMI-Electromagnetic interference EW- Electronic warfare G- Gravitational force G -Conductance G- Giga (109 ) JFET-Junction field effedt transistor L- Coil, inductance LC- Inductance-capacitance
7、 LCD- Liquid crystal display L-C-R -Inductance-capacitance-resistance LDR- Light-dependent resistor LED- Light emitting diode LF- Low frequency LM- Mutual inductance LNA- Low noise amplifier LO -Local oscillator LSI- Large scale integration LT -Total inductance N -Number of turns in an in
8、ductor N-Revolutions per minute n-Nano (10-9) N- Negative NA- Nanoampere NC- Normally closed NCNo- connection NEG, neg –Negative NF-Nanofarad nH -Nanohenry nm- Nanometer NO-Normally open NPN- Negative-positive-negative Ns- Nanosecond NW- Nanowatt OP AMP- Operational amplifier R-Poten
9、tiometer R- Resistance RAM- Random access memory RC- Resistance-capacitance, also Radio controlled Rcvr-Receiver Rect- Rectifier Ref- Reference Rf- Radio frequencies RF-Radio frequencies RFI-Radio frequency interference RL-Load resistor RLC- Resistance-capacitance-inductance RMS, rms- Ro
10、ot mean square ROM-Read only memory Rpm- Revolutions per minute T- Tera (1012) T -Torque T -Transformer t- Time in seconds TC- Time constant, also temperature coefficient TE-Transverse electric Temp-Temperature THz-Terahertz TM-Transverse magnetic TR-Transmit-receive TTL-Transistor-tra
11、nsistor logic TWT-Travelling wave tube TV - Television W –Watt XC -Capacitive reactance XL -Inductive reactance Y -Admittance Z –Impedance Zin -Input impedance Zo -Output impedance Zp -Primary impedance Zs -Secondary impedance ZT -Total impedance B -Flux density BCD -Binary coded decim
12、al bfo -Beat frequency oscillator BJT -Bipolar junction transistor BW-Bandwidth d- Deci (10-1) D/A or D-A-Digital to analog DC-Direct current DIP-Dual in-line package DMM -Digital multimeter DPDT -Double pole double throw DTL-Diode transistor logic DVM-Digital voltmeter
13、 – Frequency FET-Field effect transistor FF-Flip Flop fil -Filament FM- Frequncy modulation fr -Frequency at resonance fsk -frequency-shift keying FSD- Full scale deflection H- Henry H- Magnetic field intensity H -Magnetizing flux h- hecto (102 ) h -Hybrid HF- High frequen
14、cy hp -Horsepower Hz -Hertz I -Current i -Instantaneous current IB -DC Base current IC -DC Collector current IC- Integrated circuit Ie- Total emitter current Ieff- Effective current IF- Intermediate frequency Imax -Maximum current Imin -Minimum current I/O- Input/output IR- Infrared
15、IR- Resistor current IS -Secondary current IT -Total current K- Coefficient of coupling k- Kilo (103 ) kHz- Kilohertz kV- Kilovolt kVA- Kilovoltampere kW- Kilowatt kWh-Kilowatt-hour M-Mega (106 ) M -Mutual conductance MI -Mutual inductance m- Milli (10-3 ) mA-Milliampere mag- Magnetro
16、n max –Maximum MF- Medium frequency MH- Millihenry MHz -Megahertz min –Minimum mm- Millimeter mmf -Magnetomotive force mW- Milliwatt MOS -Metal oxide semiconductor MOSFET -Metal oxide semiconductor field effect transistor MPU- Microprocessor unit MSI- Medium scale integrated circuit mV
17、–Millivolt P- Pico (10-12) P- Power p- Instantaneous power P- Positive, also peak PA- Public address or power amplifier PA- Picoampere PAL- Programmable Array Logic PAM, pam- Pulse amplitude modulation Pap-Apparent power Pav-Average power PCB- Printed circuit board PCM, pcm-Pulse-code mo
18、dulation PDM-Pulse-duration modulation PF-Picofarad PLD-Programmable Logic Device PLL-Phase locked loop PM- Phase modulation, also Permanent magnet PNP-Positive-negative-positive POT, pot-Potentiometer P-P-Peak to peak PPM-- Pulse-position modulation PRF-Pulse repetition frequency PRT-Pul
19、se repetition time Pw- Pulse width PWM, pwm- Pulse width modulation Q-Charge, also quality q-Instantaneous charge SCR-Silicon controlled rectifier SHF-Super high frequency SIP-Single in-line package SNR-Signal-to-noise ratio SPDT-Single pole double throw sq cm- Square centimeter SSB- Sing
20、le sideband SW-Short wave SWR-Standing-wave ratio SYNC, sync-Synchronous UHF- Ultra high frequency UHV-Ultra high voltage UJT-Unijunction transistor UV-Ultraviolet V- Vacuum tube V, v-Volt v- Instantaneous voltage VA- Volt ampere Vav-Voltage (average value) VBE-DC voltage base to emitte
21、r Vc-Capacitive voltage VCE-DC voltage collector to emitter VCO-Voltage controlled oscillator VHF-Very high frequency VIn -Input voltage VL- Inductive voltage VLF- Very low frequency Vm, Vmax -Maximum voltage VOM-Volt ohm milliameter Vout -Output voltage Vp -Primary voltage VS-Source voltage VSWR-Voltage standing wave ratio VT-Total voltage
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