Units of Current

Last Updated: April 25, 2024

Units of Current

Electric current, fundamentally essential in both scientific and practical contexts, is measured in various units. The primary unit is the ampere. Known as the amp, symbolized as A, it quantifies the flow of electrical charge per second through a conductor. One ampere represents the flow of one coulomb of charge per second.

What are Units of Current?

Units of current are essential for quantifying the flow of electric charge in conductors. The ampere, commonly abbreviated as “A,” stands as the fundamental unit of electric current in the International System of Units (SI). It measures the amount of electric charge passing a point in a circuit per second with one ampere equivalent to one coulomb of charge passing per second.

SI Unit of Current


The ampere, often shortened to “amp,” is recognized globally as the SI unit of electric current. It provides a standard measure for the flow of electric charge through a conductor. Specifically, one ampere corresponds to the flow of one coulomb of charge passing through a point in one second.

CGS Unit of Current


In the Centimeter Gram-Second (CGS) system of units, the primary unit for measuring electric current is the biot, also known as the abampere. This unit differs notably from the more commonly used ampere of the SI system. Specifically, one biot is equal to ten amperes, demonstrating a larger base unit for current in the CGS system.

List of Current Units

Biot (Abampere)biot
Coulomb per secondC/s

Ampere (A)

1A = 1 C/s

The ampere is the SI unit of electric current, named after André-Marie Ampère. It quantifies the flow of electric charge through a conductor at a rate of one coulomb per second. This unit is universally employed in science and engineering to measure electrical flow.

Milliampere (mA)

1 mA = 0.001 A

This unit is extensively used in electronic applications, particularly for measuring small currents in circuits. It represents one-thousandth of an ampere, enabling precise current measurements in delicate electronic devices.

Microampere (μA)

1 μA = 0.000001 A

A microampere is a unit used to measure extremely low electrical currents. This precision is crucial in microelectronic applications, such as in the operation of transistors and other semiconductor devices.

Biot (Abampere)

1 biot = 10 A

The biot, also known as abampere, is the CGS unit of current. It measures the amount of current when ten amperes are flowing through a conductor, often utilized in certain scientific contexts where the CGS system remains relevant.


1 statA = 3.33564×10−10 A

A statampere is the CGS electrostatic unit of current, used primarily in theoretical physics. It quantifies a small but significant flow of charge derived from electrostatic units of charge.

Coulomb per Second (C/s)

1 C/s = 1 A

Coulomb per second is another expression for the ampere, emphasizing the rate of charge flow. It is directly equivalent to an ampere, reinforcing the fundamental relationship between charge and current in electrical measurements.

Conversion of Current Units

Conversion of Current Units

Here is a table format for different units of electric current, presented in a manner similar to the energy conversion factors you provided. Each cell after the unit’s name shows the conversion factors to other current units, such as from amperes to milliamperes, microamperes, and biots (abamperes).

Current UnitAmpere (A)Milliampere (mA)Microampere (μA)Biot (Abampere)
Ampere (A)010001,000,0000.1
Milliampere (mA)0.001010000.0001
Microampere (μA)0.0000010.00100.0000001
Biot (Abampere)1010,00010,000,0000

Ampere to Milliampere

Conversion: 1 A = 1000 mA

Example: To convert 2 amperes to milliamperes, multiply by 1000.

2 A × 1000 = 2000 mA

Ampere to Microampere

Conversion: 1 A = 1,000,000 μA

Example: To convert 0.5 amperes to microamperes, multiply by 1,000,000.

0.5 A × 1,000,000 = 500,000 μA

Milliampere to Ampere

Conversion: 1 mA = 0.001 A

Example: To convert 1500 milliamperes to amperes, divide by 1000.

1500 mA / 1000 = 1.5 A

Milliampere to Microampere

Conversion: 1 mA = 1000 μA

Example: To convert 3 milliamperes to microamperes, multiply by 1000.

3 mA × 1000 = 3000 μA

Microampere to Ampere

Conversion: 1 μA = 0.000001 A

Example: To convert 2000000 microamperes to amperes, divide by 1,000,000.

2000000 μA / 1,000,000 = 2 A

Microampere to Milliampere

Conversion: 1 μA = 0.001 mA

Example: To convert 1000 microamperes to milliamperes, divide by 1000.

1000 μA / 1000 = 1 mA

Biot to Ampere

Conversion: 1 biot = 10 A

Example: To convert 3 biots to amperes, multiply by 10.

3 biots × 10 = 30 A

Ampere to Biot

Conversion: 1 A = 0.1 biot

Example: To convert 50 amperes to biots, multiply by 0.1.

50 A × 0.1 = 5 biots


How is a current measured?

Electric current is measured using instruments like ammeters, which directly record the flow of electrical charge through a conductor.

What should the units be for current?

The units for measuring electric current are amperes, commonly abbreviated as amps.

What is used to measure electric current?

To measure electric current, devices called ammeters are used, effectively measuring the charge flow in circuits.

AI Generator

Text prompt

Add Tone

10 Examples of Public speaking

20 Examples of Gas lighting