Tables

SI electromagnetism units
Name	Symbol	Dimensions	Quantity
ampere (SI base unit)	A	A	Current
coulomb	C	A·s	Electric charge, Quantity of electricity
volt	V	J/C = kg·m²·s⁻³·A⁻¹	Potential difference
ohm	Ω	V/A = kg·m²·s⁻³·A⁻²	Resistance, Impedance, Reactance
ohm metre	Ω·m	kg·m³·s⁻³·A⁻²	Resistivity
farad	F	C/V = kg⁻¹·m⁻²·A²·s⁴	Capacitance
farad per metre	F/m	kg⁻¹·m⁻³·A²·s⁴	Permittivity
reciprocal farad	F⁻¹	kg¹·m²·A⁻²·s⁻⁴	Elastance
siemens	S	Ω⁻¹ = kg⁻¹·m⁻²·s³·A²	Conductance, Admittance, Susceptance
siemens per metre	S/m	kg⁻¹·m⁻³·s³·A²	Conductivity
weber	Wb	V·s = kg·m²·s⁻²·A⁻¹	Magnetic flux
tesla	T	Wb/m² = kg·s⁻²·A⁻¹	Magnetic flux density
ampere per metre	A/m	m⁻¹·A	magnetic induction
ampere-turns per weber	A/Wb	kg⁻¹·m⁻²·s²·A²	Reluctance
henry	H	V·s/A = kg·m²·s⁻²·A⁻²	Inductance
henry per metre	H/m	kg·m·s⁻²·A⁻²	Permeability
(dimensionless)	-	-	Magnetic susceptibility

Volt (E) is the unit of electric pressure or electromotive force. It is the potential that will produce a current of 1 ampere through a resistance of 1 ohm.

Ampere (I) is the unit of electrical current (coulombs per second).

Ohm (R) is the unit of electrical resistance (volts/ampere).

Watts (W) and kilowatts (KW) are units of electric power.

Kilovolt-ampere (KVA) is a measurement of apparent electric power.

Kilowatt hour (Kwhr) is a unit of electrical energy or work performed.

Joule (J) is a metric unit of energy: watt per second.
1 Kwhr = 2,655,000 ft-lb = 1.341 hp-hr = 3413 Btu = 3,600,000 joules.

Ohm law relationships (direct current) E = IR + W/I = √WR
W = I²R = E²/R = EI
I = E/R = W/E = √W/R
R = E/I = W/I² = E²/W

Required	Direct current	Alternating current
Required	Direct current	Single-phase	3-phase*
KVA	—	IE 1000	1.73 IE 1000
Kilowatts	IE 1000	IE (pf) 1000	1.73 IE (pf) 1000
Horsepower (output)	IE (eff)/746	IE (eff)(pf)/746	1.73 IE (eff)(pf)/746
Joules	IE/sec	IE (eff)(pf)/sec	1.73 IE (eff)(pf)/sec
Amperes (hp known)	746 (hp)/E (eff)	746 (hp)/E (eff)(pf)	746 (hp)/1.73 E (eff)(pf)
Amperes (KW known)	1000 KW/E	1000 KW/E (pf)	1000 KW/1.73 E (pf)
Amperes (kva known)	—	1000 KVA/E	1000 KVA/1.73 E

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