Electrical & electronic units of electric current, voltage, power, resistance, capacitance, inductance, electric charge, electric field, magnetic flux, frequency:
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)
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
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
One volt is the energy of 1 joule that is consumed when electric charge of 1 coulomb flows in the circuit.
1V = 1J / 1C
1A = 1C / 1s
Ohm is the electrical unit of resistance.
1Ω = 1V / 1A
1W = 1J / 1s
1W = 1V · 1A
10dBm = 10 · log10(10mW / 1mW)
10dBW = 10 · log10(10W / 1W)
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 · 1(m / s)2
Kilowatt-hour is a unit of energy.
1kWh = 1kW · 1h = 1000W · 1h
Hertz is the unit of frequency. It measures the number of cycles per second.
1 Hz = 1 cycles / s