The standard unit for electrical pressure is the volt. In an electrical circuit, 1 volt of electrical pressure induces the flow of electrons to produce 1 ampere of electrical current against a resistance that is equal to 1 ohm.
Electrical pressure, also known as electrical potential, voltage and electromotive force, or EMF, pertains to the amount of force required to generate a flow of electrical current. One of the principles in physics, called Ohm's Law, proposes that within a conductor, such as an electrical wire, the amount of current that is generated is equivalent to the applied EMF divided by the conductor's resistance. It can be mathematically represented by the equation I = V/R, where "I" indicates the current, "V" denotes the voltage or EMF and "R" represents the resistance.
Batteries are a primary source of EMF. These electrical devices are designed in such a way that one terminal contains an excess number of electrons while the other end has significantly less electrons. By using a conductor, the electrons can flow from one end to balance the shortage of electrons at the other terminal. Increasing the electrical pressure that is flowing in the conductor causes more electrons to travel along the conductor. This, in turn, results in a higher production amount of electrical current . Lead acid batteries normally contain 2 volts per cell, nickel-based batteries either contain 1.25 volts or 1.2 volts and lithium ion batteries typically deliver 3.6 volts per cell.