This document discusses several key concepts in electricity including: 1. Electric current is defined as the rate of flow of electric charge through a surface. The SI unit for current is the ampere. 2. Ohm's law states that the current through a conductor is directly proportional to the voltage applied. It is defined by the equation I = V/R where I is current, V is voltage, and R is resistance. 3. Resistance depends on the material properties, length, and cross-sectional area of the conductor. It can also vary with temperature according to its temperature coefficient.

1. Electric Current, Ohm’s Law, and Electric Circuits ISAT 241 Fall 2002 David J. Lawrence