Current Electricity

This section covers the fundamentals of electric current, including its definition, properties, Ohm's Law, and the factors influencing resistance.

Introduction

This section introduces the concept of electric current, distinguishing between stationary and moving electric charges and explaining the nature and significance of steady currents in various applications.

Electric Current

Electric current refers to the flow of electric charge and is key to understanding electricity and its applications.

Electric Currents In Conductors

This section discusses the movement of electric currents through conductors, specifically focusing on how electric fields influence the free electrons in solids.

Ohm's Law

Ohm's Law establishes the relationship between voltage, current, and resistance in electrical circuits.

Drift Of Electrons And The Origin Of Resistivity

This section discusses the drift of electrons in conductors under an electric field and the resulting concepts of resistivity and conductivity.

Mobility

Mobility measures how easily charge carriers can move through a conductor under the influence of an electric field.

Limitations Of Ohm's Law

Ohm's Law, though widely applicable, has significant limitations in certain materials and devices.

Resistivity Of Various Materials

This section discusses the resistivity of different materials, classifying them as conductors, semiconductors, and insulators based on their resistivity values.

Temperature Dependence Of Resistivity

The resistivity of materials varies with temperature; the relationship is more linear for metals and non-linear for semiconductors.

Electrical Energy Power

The section discusses electrical energy power, focusing on the relationship between electric potential, current, and power, and introduces key equations related to energy dissipation in conductors.

Cells Emf Internal Resistance

This section explores the concept of electromotive force (emf) in electrolytic cells, focusing on the internal resistance that affects the voltage across external loads.

Cells In Series And In Parallel

This section discusses how cells (batteries) can be arranged in series and parallel configurations in electric circuits, detailing their effects on voltage and internal resistance.

Kirchhoff's Rules

Kirchhoff's rules are fundamental principles used to analyze complex electrical circuits, enabling the calculation of currents and potential differences in various configurations of resistors and power sources.

Wheatstone Bridge

The Wheatstone Bridge is a circuit configuration used to measure unknown resistances by balancing two legs of a bridge circuit.

Summary

This section summarizes key concepts regarding electric current, resistance, and the laws governing them.