Current and Ohm's Law - General Physics

Explore the fundamental concepts of Electric Current and Ohm's Law in this comprehensive 21-minute physics lesson. Begin with an introduction to electric current, including its definition as the flow of charge over time and the SI unit of Ampere. Learn about conventional current and its representation as the flow of positive charges. Dive into Ohm's Law, a crucial principle in General Physics 2, expressed as Delta V=IR. Understand how this law relates potential drop, electric current, and resistance. Discover three equivalent expressions for power dissipation in resistors and apply them in practical calculations. Investigate the relationship between resistance, resistivity, wire length, and cross-sectional area. Examine the temperature dependence of resistivity and resistance, including the temperature coefficient of resistivity. Conclude with a brief overview of superconductors and their unique properties at low temperatures. Enhance your understanding of these essential physics concepts through clear explanations and practical examples.

Lesson Introduction
Definition of Electric Current and Conventional Current
Ohm's Law
Power Dissipated by a Resistor
Resistivity and Resistance
Temperature Dependence of Resistivity and Resistance
Superconductors