V

voltage source Circuit that gives voltage to a load.

voltaic cell Primary cell used to produce a voltage.

volt-ampere Unit of apparent power in an AC circuit .

voltmeter Instrument used to measure difference in potential between two points.

volume Magnitude or power level of audio frequency. Measured in volume units (VU).

valence shell The outermost electron shell for a given atom.

variable capacitor Capacitor whose capacitance can be change by varying the distance between the plates.

variable resistor Resistor whose resistance can be changed or varied.

VCR Abbreviation for "video cassette recorder."

vector Quantity having both magnitude and direction.

very high frequency (VHF) Electromagnetic frequency band from 30 MHz to 300 MHz.

very low frequency (VLF) Frequency band from 3 kHz to 30 kHz.

volt Unit of potential difference or electromotive force. One volt is the potential difference needed to produce one ampere of current through a resistance of one ohm.

voltage (V) Term used to represent electrical pressure or force that causes current to flow.

voltage amplifier Amplifier designed to make signal voltage.

voltage divider Fixed or variable series resistors connected across a voltage to get a required fraction of that voltage.

voltage drop Voltage or difference in potential formed across a component due to current flow.

voltage gain Ratio of amplifier output voltage to input voltage usually expressed in decibels.

voltage regulator Device or circuit that maintains constant output voltage or regulates voltage.