Definition of a Volt
The volt (V) is the SI unit of electric potential, electric potential difference, and electromotive force. It is named after the Italian physicist Alessandro Volta, who invented the voltaic pile, the first electric battery.
The volt is defined as the potential difference between two points in a conductor when a current of one ampere flows through it and the power dissipated between those points is one watt.
Identifying a volt
Which of the following descriptions identifies a volt?
- (A) The energy stored in a capacitor
- (B) The force between two charges
- (C) The potential difference between two points
- (D) The current flowing through a resistor
Answer: (C)
The potential difference between two points is the difference in electric potential between the two points. The volt is the SI unit of potential difference.
Applications of volts
Volts are used to measure a variety of electrical quantities, including:
- Voltage: The potential difference between two points in a circuit.
- Electromotive force (EMF): The potential difference produced by a source of electrical energy, such as a battery or generator.
- Capacitance: The ability of a capacitor to store electrical charge.
- Inductance: The ability of an inductor to store magnetic energy.
Volts are also used to control the flow of electricity in circuits. For example, a voltage regulator can be used to maintain a constant voltage across a load.
Conclusion
The volt is a fundamental unit of electrical measurement. It is used to measure a variety of electrical quantities and control the flow of electricity in circuits.