- A (amp)
- Ampere
- AC
- Alternating current
- AC/DC
- Alternating current or direct current
- A/D
- Analog to digital
- ADC
- Analog-to-digital converter
- AF
- Audio frequency
- AFT
- Automatic fine tunung
- AFC
- Automatic frequency control
- AFC
- Automatic flow controller, used in controlling the flow of gasses under pressure into a vacuum system
- AGC
- Automatic gain control
- Ah
- Ampere hour
- Ai
- Current gain
- AM
- Amplitude modulation
- 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 control
- AWG
- American wire gauge
- B
- Flux density
- BCD
- Binary coded decimal
- bfo
- Beat frequency oscillator
- BJT
- Bipolar junction transistor
- BW
- Bandwidth
- c
- Centi (10-2)
- C
- Capacitance or capacitor
- CAD
- Computer aided design
- CAM
- Computer aided manufacture
- 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
- Cathode ray oscilloscope
- CRT
- Cathode ray tube
- CT
- Total capacitance
- cw
- Continuous transmission
- d
- Deci (10
-1)
- D/A or D-A
- Digital to analog
- DC
- Direct current
- Di or Di
- Change in current
- DIP
- Dual in-line package
- DMM
- Digital multimeter
- DPDT
- Double pole double throw
- Dt or Dt
- Change in time
- DTL
- Diode transistor logic
- Dv or Dv
- Change in voltage
- DVM
- Digital voltmeter
- 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
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