Voltage is the difference of electrical potential between two points or two objects. Without this difference of electrical potential, electricity could not be used as a power source. More »

The unit for potential energy per unit charge, or voltage, is the volt, which has the symbol "V." It takes its name from the Italian physicist Alessandro Volta, credited with inventing one of the first electric batteries... More »

Root mean square voltage is a statistical measure of how much alternating current power is needed to produce a similar heating effect to an equal direct current power. Root mean square can be found by taking the square r... More »

The size of the electric force between two objects is affected by the strength of the charge and the distance between the objects. Objects with strong positive and negative charges will have a greater electric force. As ... More »

Electrostatic discharge, or ESD, is a sudden flow of electric current between two objects that have different electronic potentials. An electric spark is a type of ESD wherein there is a flow of electric current across a... More »

Electromotive force is the difference in electrical potential between two points that compels electricity to flow to an area of lower potential in order to equalize charge. According to the HyperPhysics website, the forc... More »

A voltmeter is an instrument used to measure the voltage between two points in an electrical circuit. Some voltmeters register direct current while others measure alternating current. More »