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 (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
|
Prefix Symbol |
Prefix 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 | 10 3 | 1kΩ = 1000Ω |
mega | M | 10 6 | 1MHz = 106Hz |
giga | G | 10 9 | 1GHz = 109Hz |
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 ⋅ log10(10mW / 1mW)
Decibel-Watt (dBW)
Decibel-watt or dBW is a unit of electric power, measured with logarithmic scale referenced to 1W.
10dBW = 10 ⋅ log10(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 = 6.238792×1018 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 / 1m2
Weber (Wb)
Weber is the unit of magnetic flux.
1Wb = 1V ⋅ 1s
Joule (J)
Joule is the unit of energy.
1J = 1 kg ⋅ m2 / s2
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
Currently, we have around 929 calculators and conversion tables to help you "do the math" quickly in areas such as:
- Free online calculators and tools
- Free online units conversion tools
- Free online web design tools
- Free online electricity & electronics tools
- Mathematics
- Online tool
- Text tool
- PDF tool
- Code
- Ecology
- Basic Electrical Terms
- Electrical & Electronic Units
- Electronic Components
- Electrical & Electronic Symbols
- Electronic Circuit Laws
- Ampere (A)
- Decibel-milliwatt (dBm)
- Decibel-Watt (dBW)
- Decibel (dB)
- Farad (F)
- Kilovolt-amp (kVA)
- Kilowatt (kW)
- Kilowatt-hour (kWh)
- Ohm (Ω)
- Volt (V)
- Watt (W)
And we are still developing more. Our goal is to become the one-stop, go-to site for people who need to make quick calculations or who need to find quick answer for basic conversions.
Additionally, we believe the internet should be a source of free information. Therefore, all of our tools and services are completely free, with no registration required. We coded and developed each calculator individually and put each one through strict, comprehensive testing. However, please inform us if you notice even the slightest error – your input is extremely valuable to us. While most calculators on Justfreetools.com are designed to be universally applicable for worldwide usage, some are for specific countries only.