## Electrical Units

Electrical & electronic units of electric current, voltage, power, resistance, capacitance, inductance, electric charge, electric field, magnetic flux, frequency:

## Electrical & electronic units table

Unit Name Unit Symbol Quantity Ampere (amp) A Electric current (I) Volt V Voltage (V, E) Electromotive force (E)

Potential difference (Δφ)

Ohm Ω Resistance (R) Watt W Electric power (P) Decibel-milliwatt dBm Electric power (P) Decibel-Watt dBW Electric power (P) Volt-Ampere-Reactive var Reactive power (Q) Volt-Ampere VA Apparent power (S) Farad F Capacitance (C) Henry H Inductance (L) siemens / mho S Conductance (G) Admittance (Y)

Coulomb C Electric charge (Q) Ampere-hour Ah Electric charge (Q) Joule J Energy (E) Kilowatt-hour kWh Energy (E) Electron-volt eV Energy (E) Ohm-meter Ω∙m Resistivity ( ρ)siemens per meter S/m Conductivity ( σ)Volts per meter V/m Electric field (E) Newtons per coulomb N/C Electric field (E) Volt-meter V·m Electric flux (Φ _{e})Tesla T Magnetic field (B) Gauss G Magnetic field (B) Weber Wb Magnetic flux (Φ _{m})Hertz Hz Frequency (f) Seconds s Time (t) Meter / metre m Length (l) Square-meter m ^{2}Area (A) Decibel dB Parts per million ppm

## Units prefix table

Prefix

Prefix Symbol

Prefix factor

Example pico p 10 ^{-12}1pF = 10 ^{-12}Fnano n 10 ^{-9}1nF = 10 ^{-9}Fmicro μ 10 ^{-6}1μA = 10 ^{-6}Amilli m 10 ^{-3}1mA = 10 ^{-3}Akilo k 10 ^{ 3}1kΩ = 1000Ω mega M 10 ^{ 6}1MHz = 10 ^{6}Hzgiga G 10 ^{ 9}1GHz = 10 ^{9}Hz

## Electrical units definitions

## Volt (V)

Volt is the electrical unit of voltage.

One volt is the energy of 1 joule that is consumed when electric charge of 1 coulomb flows in the circuit.

1V = 1J / 1C

## Ampere (A)

Ampere is the electrical unit of electrical current. It measures the amount of electrical charge that flows in an electrical circuit per 1 second.

1A = 1C / 1s

## Ohm (Ω)

Ohm is the electrical unit of resistance.

1Ω = 1V / 1A

## Watt (W)

Watt is the electrical unit of electric power. It measures the rate of consumed energy.

1W = 1J / 1s

1W = 1V · 1A

## Decibel-milliwatt (dBm)

Decibel-milliwatt or dBm is a unit of electric power, measured with logarithmic scale referenced to 1mW.

10dBm = 10 · log

_{10}(10mW / 1mW)## Decibel-Watt (dBW)

Decibel-watt or dBW is a unit of electric power, measured with logarithmic scale referenced to 1W.

10dBW = 10 · log

_{10}(10W / 1W)## Farad (F)

Farad is the unit of capacitance. It represents the amount of electric charge in coulombs that is stored per 1 volt.

1F = 1C / 1V

## Henry (H)

Henry is the unit of inductance.

1H = 1Wb / 1A

## siemens (S)

siemens is the unit of conductance, which is the opposite of resistance.

1S = 1 / 1Ω

## Coulomb (C)

Coulomb is the unit of electric charge.

1C = 6.238792×10

^{18}electron charges## Ampere-hour (Ah)

Ampere-hour is a unit of electric charge.

One ampere-hour is the electric charge that flow in electrical circuit, when a current of 1 ampere is applied for 1 hour.

1Ah = 1A · 1hour

One ampere-hour is equal to 3600 coulombs.

1Ah = 3600C

## Tesla (T)

Tesla is the unit of magnetic field.

1T = 1Wb / 1m

^{2}## Weber (Wb)

Weber is the unit of magnetic flux.

1Wb = 1V · 1s

## Joule (J)

Joule is the unit of energy.

1J = 1 kg · 1(m / s)

^{2}## Kilowatt-hour (kWh)

Kilowatt-hour is a unit of energy.

1kWh = 1kW · 1h = 1000W · 1h

## Kilovolt-amps (kVA)

Kilovolt-amps is a unit of power.

1kVA = 1kV · 1A = 1000 · 1V · 1A

## Hertz (Hz)

Hertz is the unit of frequency. It measures the number of cycles per second.

1 Hz = 1 cycles / s

## See also