- V -

Voltage

1. A specific quantity of electrical force. The unit of electromotive force that causes current to flow when included in a closed circuit. One volte causes a current of one ampere to flow through a resistance of one Ohm.

Voltage Cupling

A setting that enables an ocilloscope to read a type of voltage. AC coupling allowes the scope to filter out the DC and read only AV voltage, DC coupling allowes the scope to read AC and DC voltages, Ground coupling displays the ground trace.

Voltage Drop

The amount of voltage used up or dropped pushing the amperage across any resistance value.

Voltage Limiter

Connected through the resistot network of a voltage regulator It controls the field voltage for the required amount of charging.

Voltage Regulator

An electrical device to control the output of a generator or alternator.

Voltage Scale

The voltage defined by each vertical divition on the scope display.

Voltage Spike

A momentary increase or decrease in voltage.

Voltage-Generating Sensor

A device having a junction of dissimilar metals that provide a small voltage output.

Voltmeter

An instrument used to read the pressure behind the flow of electrons.

Volumetric Efficiency (VE)

1. A percentage ratio that varies with the engine's rpm measuring the difference between the air-fuel mixture actually entering a cylinder and the amount that can enter under ideal conditions. 2. The ratio between the amount of air-fuel mixture that actually enters the cylinder and the amount that could enter under ideal conditions expressed as a percentage.

VOM

Volt-Ohm meter.

VOR

An acronym for vehicle off road.

Vortex Oil Flow

1. The circular oil-flow path as it leaves the impeller, travels to the turbine, then through the stator and back into the impeller. 2. A mass of whirling fluid within a torque converter when impeller speed is high and turbine speed is low.

VOTM

Vacuum operated throttle modulator.

VPW Diagnostic Protocol

Variable Pulse Width Diagnostic Protocol used on General Motors vehicles and some Chryslers considered a slow communication at 10.4 Kb/s and uses a single wire approach.

VR

Vacuum reservoir or vacuum reducer or variable reluctance.

VR/S

Vacuum regulator/solenoid.

VRCM

Variable relay control module.

VRDV

Vacuum retard delay valve.

VREF

Reference Voltage.