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 = 10-12F |
| nano | n | 10-9 | 1nF = 10-9F |
| micro | μ | 10-6 | 1μA = 10-6A |
| milli | m | 10-3 | 1mA = 10-3A |
| kilo | k | 103 | 1kΩ = 1000Ω |
| mega | M | 106 | 1MHz = 106Hz |
| giga | G | 109 | 1GHz = 109Hz |
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
