Wednesday, November 12, 2008


Voltage, or electrical tension, is the difference of electrical potential between two points of an electrical circuit expressed in volts. It is the measurement of the potential for an electric field to cause an electric current in an electrical conductor. Voltage should actually be called potential difference. It is the electron-driving force in electricity, called electromotive force (emf) and the potential difference is responsible for the pushing and pulling of electrons or electric current through a circuit. In other words, electrical potential difference can be thought of as the ability to move electrical charge through a resistance.