Equivalently, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. One volt is defined as the difference in electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. Current (I) is the rate of flow of Charge Carriers, such as electrons.Current is usually thought of as moving in the direction of positive charge, so from the positive power supply to the negative. As you said, voltage is a way of measuring electromotive force, since a force acting on a charge gives it the ability to do work, aka a voltage is created. The unit of potential difference is the Volt (V), which is equal to a Joule per Coulomb (J/C). This difference in charge between the two points is called voltage. One point has more charge than another. We define voltage as the amount of potential energy between two points on a circuit. EMF can be stated as the work done per unit of charge and the SI unit of Electromotive force is Volt. Alessandro Volta Therefore, another way of expressing Kirchhoff’s voltage law in equation form is: V s – V 1 – V 2 – V 3 – . . – V n = 0. Electron volt definition is - a unit of energy equal to the energy gained by an electron in passing from a point of low potential to a point one volt higher in potential : 1.60 × 10—19 joule. We define electron volts as 'the energy required to accelerate an electron across a potential difference of 1 volt'. . Current, Voltage and Power. A voltage source is a device used in electric circuits that has a fixed potential difference between its ends. ; Current. When the resistor voltage are added together, their sum will equal the source voltage. Electricity is the flow of electric charge.We can describe the flow of electric charge in several ways. The same is true of joules and electron volts. One Volt is defined as energy consumption of one joule per electric charge of one coulomb. A voltage source can be a battery, or another source of direct current with a fixed potential difference. Learn more about the difference between electromotive force and potential difference and dimension of electromotive force here. Definition. The volt per meter, or some fractional unit based on it, is used as a means of specifying the intensity of the electromagnetic field (EM field) produced by a radio transmitter. In physics, an electronvolt (symbol eV, also written electron-volt and electron volt) is the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt in vacuum. 1V = 1J/C. These include the quantities Current, Voltage and Power. One volt is equal to current of 1 amp times resistance of 1 ohm: 1V = 1A ⋅ 1Ω. 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