Difference between Volt and Amp

Voltage and amperage are both significant topics in electrical engineering. While they are related, they are relevant to different electrical circuit features.

Voltage and current are two important electrical concepts. Voltage, measured in volts (V), is the potential difference between two points in a circuit that drives current flow. The flow of electric charge through a conductor is referred to as current, which is measured in amperes (A or amps).

Read this article to find out more about Volt and Amp and how they are different from each other.

What is Volt?

Voltage is a fundamental term in electricity that explains the force or pressure that drives the flow of electric current through a circuit. It is also known as the electric potential difference. The volt is the unit of voltage named after Alessandro Volta, an Italian physicist who built the first chemical battery in 1800.

Volt (V) is the standard unit of voltage measurement. One volt is defined as the electrical potential difference between two points in a circuit where one joule of energy is required to move one coulomb of electric charge from one point to another.

What is Amp?

An ampere (A), often known as an "amp," is a unit of electric current that is defined as the flow of electric charge across a conductor over time. The sign I is used to represent current, which is measured in amperes.

Electric current is measured in amperes and is represented by the letter "I." One ampere of current is defined as one coulomb of charge per second of flow. In other words, if one ampere of current flows through a conductor, one coulomb of charge flows through the conductor each second.

The force between two parallel conductors carrying electric current is used to define the ampere unit. When two parallel wires are positioned close together and carry opposite electric currents, a force will push them apart or towards each other, depending on the direction of the currents. The magnitude of this force is related to the product of currents and wire distance.

The ampere is defined as a constant current that, if maintained in two straight, parallel conductors of infinite length and negligible circular cross-section and placed one metre apart in a vacuum, would produce a force of 210–7 newtons per metre of length between these conductors.

The conductor's characteristics and the voltage placed across it control the flow of electric current. The relationship between voltage, current, and resistance in a circuit is defined by Ohm's Law. It states that the current flowing through a conductor is proportional to the voltage placed across it and inversely proportional to the conductor's resistance.

Difference between Volt and Amp

The following table highlights the major differences between Volt and Amp −






I or A

Measured in

Volts (V)

Amperes (A)


V = IR (Ohms law)

I = V/R (Ohms law)


It is used to determine the current flow in a circuit.

It is used to determine the rate of charge flow in a circuit.


It represents energy per unit of charge.

It represents a charge per unit of time.

Measurement between

Volt measures two points in a circuit.

Amperes measure a single point in a circuit.


It uses a voltmeter to measure the instruments.

It uses the ampere to measure the instruments.


In conclusion, voltage and current are two important concepts in electricity that are firmly correlated. The potential difference between two points in a circuit is referred to as voltage, whereas current is the flow of electric charge through a conductor. Voltage is measured in volts, whereas current is measured in amperes.

Understanding the difference between voltage and current is essential to anyone who works with electrical systems because it allows for accurate circuit design, maintenance, and troubleshooting.

Updated on: 02-May-2023


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