Electrical units table | Units prefix table | Electrical units definitions

## Electrical Units table

Name |
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 (Φe) |

Tesla | T | Magnetic field (B) |

Gauss | G | Magnetic field (B) |

Weber | Wb | Magnetic flux (Φm) |

Hertz | Hz | Frequency (f) |

Seconds | s | Time (t) |

Meter / metre | m | Length (l) |

Square-meter | m2 | Area (A) |

Decibel | dB | |

Parts per million | ppm |

### Units Prefix table

Prefix | Symbol | Factor | Example |
---|---|---|---|

pico | p | 10^{-12} |
1pF = 10^{-12}F |

nano | n | 10^{-9} |
1nF = 10^{-9}F |

micro | μ | 10^{-6} |
1μA = 10^{-6}A |

milli | m | 10^{-3} |
1mA = 10^{-3}A |

kilo | k | 10^{3} |
1kΩ = 1000Ω |

mega | M | 10^{6} |
1MHz = 10^{6}Hz |

giga | G | 10^{9} |
1GHz = 10^{9}Hz |

### Electrical Units Definitions

**Ampere (A)**

Electrical unit of electrical current and measures the amount of electrical charge in an electrical circuit (per 1 second).

1A = 1C / 1s

**Volt (V)**

Electrical unit of voltage.

1V = 1J / 1C

**Ohm (Ω)**

Electrical unit of resistance.

1Ω = 1V / 1A

**Watt (W)**

Electrical unit of electric power and measures the rate of consumed energy.

1W = 1J / 1s

1W = 1V ⋅ 1A

**Decibel-milliwatt (dBm)**

Unit of electric power, measured with logarithmic scale referenced to 1mW.

10dBm = 10 ⋅ log10(10mW / 1mW)

**Decibel-Watt (dBW)**

Unit of electric power, measured with logarithmic scale referenced to 1W.

10dBW = 10 ⋅ log10(10W / 1W)

**Farad (F)**

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

1F = 1C / 1V

1H = 1Wb / 1A

**siemens (S)**

Unit of conductance, which is the opposite of resistance.

1S = 1 / 1Ω

**Coulomb (C)**

Unit of electric charge.

1C = 6.238792×1018 electron charges

**Ampere-hour (Ah)**

Ampere-hour is a unit of electric charge.

One ampere-hour

1Ah = 1A ⋅ 1hour

1Ah = 3600C

**Tesla (T)**

Unit of magnetic field.

1T = 1Wb / 1m2

**Weber (Wb)**

Unit of magnetic flux.

1Wb = 1V ⋅ 1s

1J = 1 kg ⋅ m2 / s2

**Kilowatt-hour (kWh)**

Unit of energy.

1kWh = 1kW ⋅ 1h = 1000W ⋅ 1h

**Kilovolt-amps (kVA)**

Unit of power.

1kVA = 1kV ⋅ 1A = 1000 ⋅ 1V ⋅ 1A

**Hertz (Hz)**

Unit of frequency. It measures the number of cycles per second.

1 Hz = 1 cycles / s