Explanation
A physical quantity reflecting the relationship between electric field and current density in a conductor. When there is no current present in a conductor, the charge moves irregularly at the microscopic level. The macroscopic average velocity is zero, and there is no current present; If an electric field is added to a conductor, the charge superimposes a regular motion on top of the irregular motion. Positive charges move along the direction of the electric field, while negative charges move against the direction of the electric field, forming a current. The converse of electric conductivity to resistivity is a parameter that determines conductor resistance.
Classification
Fundamental of Material Science -> Performance basis of materials