Electrical quantities

These are the most common quantities and units used in electronics.

name symbol unit symbol
charge Q coulomb C
current I ampere A
voltage V volt V
resistance R ohm Ω
power P watt W
capacitance C farad F
inductance L henry H
conductance G siemens S
energy E joule J
resistivivity ρ ohm-meter Ω∙m
conductivity σ siemens per meter S/m