Umair Gaines
Voltage, or electric tension, is the difference in electric potential between two points. It is measured in volts (V) and is the force that pushes electrons through a conducting loop, enabling them to do work, such as illuminating a light. The volt is named after Alessandro Volta, who in 1798, first used the term electromotive force in a letter to Giovanni Aldini.
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What You'll Learn
- The volt is the unit of electric potential, electric potential difference (voltage), and electromotive force
- Voltage is the pressure from an electrical circuit's power source that pushes charged electrons
- Voltage is either alternating current (AC) voltage or direct current (DC) voltage
- The volt is named after Alessandro Volta
- The volt is measured in V
The volt is the unit of electric potential, electric potential difference (voltage), and electromotive force
The volt, with the symbol V, is the unit of electric potential, electric potential difference (voltage), and electromotive force. It is named after the Italian physicist Alessandro Volta, the inventor of the voltaic pile, a forerunner of today's household battery. In the early days of electricity, voltage was known as electromotive force (emf).
The volt is defined as the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. It can be expressed in terms of SI base units (m, kg, s, and A) as:
> V = W/A = kg·m^2·s^-3·A^-1
Equivalently, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can also be expressed as amperes times ohms (current times resistance, Ohm's law), webers per second (magnetic flux per time), watts per ampere (power per current), or joules per coulomb (energy per charge).
The volt is used to measure the potential for energy to travel, with more voltage in an electrical system leading to more current flow. Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a light. It is the difference in electric potential between two points, corresponding to the work needed per unit of charge to move a positive test charge from the first point to the second point.
The various voltages in a circuit can be computed using Kirchhoff's circuit laws. When talking about alternating current (AC), there is a difference between instantaneous voltage and average voltage. Instantaneous voltages can be added for direct current (DC) and AC, but average voltages can only be meaningfully added when they apply to signals with the same frequency and phase.
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Voltage is the pressure from an electrical circuit's power source that pushes charged electrons
The volt (V) is the unit of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI). One volt is defined as the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. It can be expressed in terms of SI base units (m, kg, s, and A) as:
> V = W/A = kg·m^2·s^-3·A^-1
The volt is named after Italian physicist Alessandro Volta (1745-1827), who invented the voltaic pile, a forerunner of today's household battery. In electricity's early days, voltage was known as electromotive force (emf). This is why, in equations such as Ohm's Law, voltage is represented by the symbol E.
A neat analogy to help understand the concept of voltage is a system of plumbing pipes. Voltage is equivalent to the water pressure, the current (amperage) is equivalent to the flow rate, and the resistance is like the pipe size.
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Voltage is either alternating current (AC) voltage or direct current (DC) voltage
Voltage, also known as electric potential difference, electric pressure, or electric tension, is the difference in electric potential between two points. The volt (V) is the unit of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI).
In contrast, DC voltage is a method in which electricity always flows in a certain direction, and the voltage is always constant. In a DC circuit, a power source such as a battery has a positive and negative terminal, and the load also has positive and negative terminals. To complete the circuit, positive charges need to flow from the power source to the load and then back to the negative terminal of the battery.
Some forms of DC, such as those produced by a voltage regulator, have almost no variations in voltage but may have variations in output power and current. A direct current circuit consists of any combination of constant voltage sources, constant current sources, and resistors.
The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.
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The volt is named after Alessandro Volta
The volt, a unit of electromotive force that drives current, was named after Alessandro Volta, an Italian physicist. Born in 1745, Volta's early interest in science led him to pursue physics, specialising in electricity. In 1774, he became a professor of physics at the Royal School in Como and, in the same year, improved the electrophorus, a device that produced static electricity.
In 1776, Volta's interest in gases led him to discover methane. He also studied electrical capacitance, developing separate means to study both electrical potential difference (V) and charge (Q). This work led to what is now known as Volta's Law of Capacitance, and the unit of electrical potential was named the volt in his honour in 1881.
In 1791, Volta's friend Luigi Galvani announced that the contact of two different metals with the leg muscles of a skinned frog resulted in the generation of an electric current. Galvani interpreted this as a new form of electricity found in living tissue, which he called "animal electricity". Volta disagreed, believing that the frog merely conducted a current that flowed between the two metals, which he called "metallic electricity". This professional disagreement led Volta to develop the forerunner of the electric battery, the so-called voltaic pile, which produced a steady electric current.
In 1800, Volta announced the first electric battery, which provided the first source of continuous current. This invention quickly led to a new wave of electrical experiments. For instance, within six weeks of Volta’s announcement, English scientists William Nicholson and Anthony Carlisle used a voltaic pile to decompose water into hydrogen and oxygen, thus discovering electrolysis and creating the field of electrochemistry.
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The volt is measured in V
The volt, denoted by the symbol V, is the unit of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI). One volt is defined as the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. It can be expressed in terms of SI base units (m, kg, s, and A) as:
> V = W/A = kg·m^2·s^-3·A^-1
Equivalently, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it. It can be expressed in terms of SI base units (m, kg, s, and A) as:
> V = J/C = kg·m^2·s^-3·A^-1
The volt is named after Alessandro Volta, the Italian physicist who invented the voltaic pile, the forerunner of today's household battery. In electricity's early days, voltage was known as electromotive force (emf). This is why, in equations such as Ohm's Law, voltage is represented by the symbol E.
In a static electric field, voltage corresponds to the work needed per unit of charge to move a positive test charge from one point to another. Voltage is also known as electric tension or electric pressure, and it is measured in volts. The term tension is still used in certain contexts, such as "high tension" (HT) in automotive electronics and systems using thermionic valves (vacuum tubes).
The volt can also be expressed in various other ways, including amperes times ohms (current times resistance, as per Ohm's law), webers per second (magnetic flux per time), watts per ampere (power per current), or joules per coulomb (energy per charge).
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Frequently asked questions
A volt is the unit of electric potential, electric potential difference (voltage), and electromotive force in the International System of Units (SI). It is named after Alessandro Volta, the Italian physicist who invented the voltaic pile, a forerunner of today's household battery.
One volt is defined as the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. It can be measured with a voltmeter.
Voltage is the pressure from an electrical circuit's power source that pushes charged electrons (current) through a conducting loop. More voltage in an electrical system makes more current flow.
