7 articles
Charge density
Charge density is the amount of electric charge per unit length, area, or volume, written as linear density λ, surface density σ, or volume density ρ, and used to calculate electric fields.
Current density
Current density, also known as electric current density, is a vector quantity giving the electric current per unit area at a point, measured in amperes per square meter (A/m²).
Faraday constant
The Faraday constant (F), named for Michael Faraday, is the electric charge of one mole of electrons, about 96,485 C/mol, exact since the 2019 SI redefinition.
Inrush current
Inrush current, also called input surge current, is the momentarily large current drawn by an electrical device when power is first applied, often several times its steady-state current.
Mass-to-charge ratio
The mass-to-charge ratio, abbreviated m/z, is a dimensionless quantity used to characterize ions in mass spectrometry, defined by IUPAC as mass number divided by charge number.
Speed of electricity
Speed of electricity, or velocity of electricity, is how fast an electrical signal propagates along a conductor, roughly 10⁸ m/s, while electrons themselves drift at about 10⁻⁴ m/s.
Surface charge density
Surface charge density, written σ = Q/A, is the electric charge per unit area on a surface, measured in coulombs per square meter; on conductors it governs the external electric field.