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VAC
Volts of alternating current.
VARS
An abbreviation for volt-ampere,
reactive.
VDC
Volts of direct current.
Vector
A line used to represent both direction
and magnitude.
Volt (V)
The unit of voltage or
potential difference.
Voltage Drop
The loss of voltage
between the input to a device and the output from a device due to the
internal impedance or resistance of the device. In all electrical systems,
the conductors should be sized so that the voltage drop never exceeds 3% for
power, heating, and lighting loads or combinations of these. Furthermore,
the maximum total voltage drop for conductors for feeders and branch
circuits combined should never exceed 5%.
VOM
Volt ohm-meter.
Voltage
Electrical pressure, the
force which causes current to flow through a conductor. Voltage must be
expressed as a difference of potential between two points since it is a
relational term. Connecting both voltmeter leads to the same point will show
no voltage present although the voltage between that point and ground may be
hundred or thousands of volts. This is why most nominal voltages are
expressed as "phase to phase" or "phase to neutral". The unit of measurement
is "volts". The electrical symbol is "e".
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