Units of Electricity

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Created by: Team Physics - Examples.com, Last Updated: April 25, 2024

Units of Electricity

eElectricity, a fundamental force in the universe, plays a pivotal role in various aspects of modern life, from powering homes and industries to enabling communication and transportation systems. Understanding and quantifying electricity require the use of standardized units that facilitate measurement, analysis, and communication in scientific and engineering contexts. These units provide a consistent framework for expressing electric quantities such as current, voltage, resistance, and power. In the field of physics, the study of electricity involves exploring the relationships between these fundamental quantities and their interactions within electrical circuits and systems. Whether it’s measuring current in amperes, voltage in volts, or resistance in ohms, units of electricity form the foundation for our understanding and utilization of this essential force.

What is Units of Electricity

Units of electricity refer to standardized measures used to quantify various electric quantities such as current, voltage, resistance, and power. These units provide a common framework for expressing and comparing electrical properties in scientific, engineering, and practical applications. Examples of units of electricity include the ampere (A) for current, volt (V) for voltage, ohm (Ω) for resistance, and watt (W) for power. By using consistent units, engineers, scientists, and technicians can accurately measure, analyze, and communicate electrical parameters, facilitating the design, operation, and troubleshooting of electrical systems and devices.

SI Unit of Volume

SI Unit: Ampere (A), Volt (V), Ohm (Ω), Watt (W)

Current (I)

  • Unit: Ampere (A)
  • Symbol: A
  • Definition: The ampere is the base unit of electric current in the SI system. One ampere is defined as the amount of electric charge passing through a conductor per second when there is a constant current flow of one coulomb per second.

Voltage (V)

  • Unit: Volt (V)
  • Symbol: V
  • Definition: The volt is the SI unit of electric potential difference or electromotive force. One volt is defined as the potential difference across a conductor when a current of one ampere dissipates one watt of power.

Resistance (R)

  • Unit: Ohm (Ω)
  • Symbol: Ω
  • Definition: The ohm is the SI unit of electrical resistance. One ohm is defined as the resistance between two points of a conductor when a constant potential difference of one volt applied across these points produces a current of one ampere.

Power (P):

  • Unit: Watt (W)
  • Symbol: W
  • Definition: The watt is the SI unit of power. One watt is defined as the rate at which work is done or energy is transferred when a current of one ampere flows across a potential difference of one volt.

CGS Unit of Pressure

CGS Unit: Statampere (statA), Statvolt (statV), Statohm (statΩ), Erg per second (erg/s)

Current (I)

  • Unit: Statampere (statA)
  • Symbol: statA
  • Definition: The statampere is the unit of electric current in the CGS system. One statampere is the current that, flowing through two parallel wires one centimeter apart in a vacuum, produces a force of 1 dyne per centimeter of length between the wires.

Voltage (V)

  • Unit: Statvolt (statV)
  • Symbol: statV
  • Definition: The statvolt is the unit of electric potential difference or electromotive force in the CGS system. One statvolt is the potential difference between two points in a vacuum that will impart one statampere of current when connected by a resistance of one statohm.

Resistance (R)

  • Unit: Statohm (statΩ)
  • Symbol: statΩ
  • Definition: The statohm is the unit of electrical resistance in the CGS system. It is defined as the resistance in which a potential difference of one statvolt produces a current of one statampere.

Power (P)

  • Unit: Erg per second (erg/s)
  • Symbol: erg/s
  • Definition: The erg per second, also known as the erg-second or the erg per second, is a unit of power in the CGS system. It is equivalent to one erg of energy transferred or work done per second.

List of Electricity Units

SI UnitSymbol
Ampere (A)A
Volt (V)V
Ohm (Ω)Ω
Watt (W)W

Conversion of Electricity Units

QuantityConversionConversion FormulaExample
CurrentA (Ampere) to mA (Milliampere)1 A = 1000 mA10 A = 10,000 mA
mA (Milliampere) to A (Ampere)1 mA = 0.001 A10 mA = 0.01 A
VoltageV (Volt) to mV (Millivolt)1 V = 1000 mV10 V = 10,000 mV
mV (Millivolt) to V (Volt)1 mV = 0.001 V10 mV = 0.01 V
ResistanceΩ (Ohm) to mΩ (Milliohm)1 Ω = 1000 mΩ10 Ω = 10,000 mΩ
mΩ (Milliohm) to Ω (Ohm)1 mΩ = 0.001 Ω10 mΩ = 0.01 Ω
PowerW (Watt) to mW (Milliwatt)1 W = 1000 m10 W = 10,000 mW
mW (Milliwatt) to W (Watt)1 mW = 0.001 W10 mW = 0.01 W


A (Ampere) to mA (Milliampere)

1 A = 1000 mA

To convert from Ampere (A) to Milliampere (mA), you multiply the value in Ampere by 1000.

mA (Milliampere) to A (Ampere)

1 mA = 0.001 A

To convert from Milliampere (mA) to Ampere (A), you divide the value in Milliampere by 1000.


V (Volt) to mV (Millivolt)

1 V = 1000 mV

To convert from Volt (V) to Millivolt (mV), you multiply the value in Volt by 1000.

mV (Millivolt) to V (Volt)

1 mV = 0.001 V

To convert from Millivolt (mV) to Volt (V), you divide the value in Millivolt by 1000.


Ω (Ohm) to mΩ (Milliohm)

1 Ω = 1000 mΩ(Milliohm)

To convert from Ohm (Ω) to Milliohm (mΩ), you multiply the value in Ohm by 1000.

mΩ (Milliohm) to Ω (Ohm)

1 mΩ = 0.001 Ω

To convert from Milliohm (mΩ) to Ohm (Ω), you divide the value in Milliohm by 1000.


W (Watt) to mW (Milliwatt)

1 W = 1000 m

To convert from Watt (W) to Milliwatt (mW), you multiply the value in Watt by 1000.

mW (Milliwatt) to W (Watt)

1 mW = 0.001 W

To convert from Milliwatt (mW) to Watt (W), you divide the value in Milliwatt by 1000.


What are the practical applications of understanding electricity units?

Understanding electricity units is essential for designing, analyzing, and troubleshooting electrical circuits in various fields such as engineering, electronics, and telecommunications.

How do I convert between different units of electricity (A, V, Ω, W)?

To convert between units, use conversion factors based on the relationship between the units. For example, to convert from ampere (A) to milliampere (mA), multiply the value in ampere by 1000.

What is the difference between milliunits and standard units (A, V, Ω, W)?

Milliunits are smaller units of measurement, representing one-thousandth of the corresponding standard unit. For example, 1 milliampere (mA) is equal to 0.001 ampere (A).

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