permittivity of a vacuum relative permittivity electric field strength
potential difference (voltage) capacitance
electric current emf
resistance resistivity
electrical energy electrical energy
magnetic flux density magnetic flux
rms value of alternating emf peak value of alternating emf rms value of alternating current peak value of alternating current number of turns (in a coil) electronic charge Planck’s constant
Q,q
o r E
V C I
E R r
W W B
Erms E0
Irms I0 N e h
coulomb
farad per metre farad per metre no unit
newton per coulomb volt per metre volt
farad
ampere volt
ohm
ohm metre joule
kilowatt-hour tesla
weber volt volt
ampere ampere no unit
coulomb joule second
*kilowatt-hour is not an SI unit, but is used in some calculations. threshold frequency
f0
work function mass number atomic number
activity of radioactive source radioactive decay constant half-life