Electric potential Converters

Electric potential, commonly called voltage, is the amount of electric potential energy per unit charge at a point in an electric field — the "pressure" that drives current through a circuit. The SI unit is the volt (V), defined as one joule per coulomb (J/C) or equivalently one watt per ampere (W/A). Everyday voltages span an enormous range: a thermocouple produces microvolts; a AA battery provides 1.5 V; USB supplies 5 V; a car battery 12 V; household mains 120–240 V; high-voltage transmission lines 66–400 kV. At the extremes, biological EEG signals sit in the microvolt range while particle accelerators operate at megavolts. Voltage, together with current and resistance, governs all electrical circuits through Ohm's law: V = IR.