Electrical Units

Comprehensive reference guide for electrical units including Ampere, Coulomb, Farad, Ohm, Henry, Joule, Siemens, Watt, Weber, Tesla, and Volt with conversions and definitions.

Unit	Symbol	Definition	Base SI Units	Common Submultiples
Ampere	A	Electric current - 1 coulomb of charge per second	A	mA (10⁻³), μA (10⁻⁶), nA (10⁻⁹), pA (10⁻¹²)
Coulomb	C	Quantity of electricity - charge conveyed in one second at 1V across 1Ω	A·s	1 C = 6.24×10¹⁸ electrons
Farad	F	Capacitance - produces 1V potential difference for 1C charge	s⁴A²/(kg·m²)	μF (10⁻⁶), pF (10⁻¹²)
Ohm	Ω	Electrical resistance - potential difference producing 1A current per 1V	kg·m²/(s³·A²)	kΩ, MΩ
Henry	H	Inductance - stores energy in magnetic field	kg·m²/(s²·A²)	μH (10⁻⁶), mH (10⁻³), nH (10⁻⁹)
Joule	J	Energy or work - 1 watt dissipated for 1 second	kg·m²/s²	1 Btu ≈ 1,055 J
Siemens	S	Electrical conductance	A/V	mS, μS
Watt	W	Power - rate of energy dissipation (joule/second)	kg·m²/s³	kW, MW, mW
Weber	Wb	Magnetic flux - 1V EMF when reduced to zero in 1 second	kg·m²/(s²·A)	1 Wb = 10⁸ Maxwells
Tesla	T	Magnetic flux density - 1 Weber per square meter	kg/(s²·A)	mT, μT
Volt	V	Electric potential or electromotive force	kg·m²/(s³·A)	kV (10³), mV (10⁻³), μV (10⁻⁶)