PEC电气工程英语证书考试-电气基本术语和定义11

PEC电气 工程 路基工程安全技术交底工程项目施工成本控制工程量增项单年度零星工程技术标正投影法基本原理 专业英语证书考试-Glossary and Definitions of Basic Electrical and el ectronics Terms Electronics is the branch of science that deals with the study of flow and control of electrons (electricity) and the study of their behavior and effects in vacuums, gases, and semiconductors, and with devices using such electrons. This control of electrons is accomplished by devices that resist, carry, select, steer, switch, store, manipulate, and exploit the electron. Here are the Most Commonly Terms and definitions used in Electronics and Electronics Engineering: 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 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 -V oltage gain A VC -Automatic volume control 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 manufacture CA TV -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- 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- Extra 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 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 inductor 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-Potentiometer 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- Root 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-transistor 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 decimal 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 – 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 frequency 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 IR- Resistor current IS -Secondary current IT -Total current K- Coefficient of coupling k- Kilo (103 ) kHz- Kilohertz kV- Kilovolt kV A- Kilovoltampere kW- Kilowatt kWh-Kilowatt-hour M-Mega (106 ) M -Mutual conductance MI -Mutual inductance m- Milli (10-3 ) mA-Milliampere mag- Magnetron 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 –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 modulation 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-Pulse 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- Single 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 V A- V olt ampere Vav-V oltage (average value) VBE-DC voltage base to emitter Vc-Capacitive voltage VCE-DC voltage collector to emitter VCO-V oltage controlled oscillator VHF-Very high frequency VIn -Input voltage VL- Inductive voltage VLF- Very low frequency Vm, Vmax -Maximum voltage VOM-V olt ohm milliameter V out -Output voltage Vp -Primary voltage VS-Source voltage VSWR-V oltage standing wave ratio VT-Total voltage