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)
|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)|
|siemens / mho||S||Conductance (G)
|Coulomb||C||Electric charge (Q)|
|Ampere-hour||Ah||Electric charge (Q)|
|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)|
|Meter / metre||m||Length (l)|
|Parts per million||ppm|
Units prefix table
|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 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 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 is the electrical unit of resistance.
1Ω = 1V / 1A
Watt is the electrical unit of electric power. It measures the rate of consumed energy.
1W = 1J / 1s
1W = 1V ⋅ 1A
Decibel-milliwatt or dBm is a unit of electric power, measured with logarithmic scale referenced to 1mW.
10dBm = 10 ⋅ log10(10mW / 1mW)
Decibel-watt or dBW is a unit of electric power, measured with logarithmic scale referenced to 1W.
10dBW = 10 ⋅ log10(10W / 1W)
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 is the unit of inductance.
1H = 1Wb / 1A
siemens is the unit of conductance, which is the opposite of resistance.
1S = 1 / 1Ω
Coulomb is the unit of electric charge.
1C = 6.238792×1018 electron charges
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 is the unit of magnetic field.
1T = 1Wb / 1m2
Weber is the unit of magnetic flux.
1Wb = 1V ⋅ 1s
Joule is the unit of energy.
1J = 1 kg ⋅ m2 / s2
Kilowatt-hour is a unit of energy.
1kWh = 1kW ⋅ 1h = 1000W ⋅ 1h
Kilovolt-amps is a unit of power.
1kVA = 1kV ⋅ 1A = 1000 ⋅ 1V ⋅ 1A
Hertz is the unit of frequency. It measures the number of cycles per second.
1 Hz = 1 cycles / s
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