Variable Frequency Drive – a technology where the rotational speed of an electric motor is controlled or varied electronically.


The unit for reactive power Q.

Voltage Drop

The voltage drop across a resistance is the product of current time’s resistance (IR).

Voltage Source

A two-terminal circuit element having an output voltage essentially independent of the current through it and characterized by a low internal resistance.

Voltage Divider

Voltage Dividers are used to supply two or more potentials to various parts of a circuit from the same power source.


The product VI, called apparent power, has the unit of volt-ampere (VA) and is indicated by the letter S.


A voltmeter is a basic device used for the measurement of electric potential or voltage, in volts.


The work required to move a unit charge in an electric field is defined as an electric potential.

Leave a Comment