CBSE 12 Physics Part 1 | 3. CURRENT ELECTRICITY by Pavan | Learn Smarter
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3. CURRENT ELECTRICITY

This chapter discusses the fundamental principles of electric current and its behavior in conductors. It covers Ohm's law, the characteristics of conductors, and the impact of temperature on resistance. Additionally, it introduces concepts like current density, electromotive force, and Kirchhoff's rules for circuits, culminating in practical applications such as the Wheatstone bridge.

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Sections

  • 3

    Current Electricity

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

    Learning Practice

  • 3.1

    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.

    Learning Practice

  • 3.2

    Electric Current

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

    Learning Practice

  • 3.3

    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.

    Learning Practice

  • 3.4

    Ohm's Law

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

    Learning Practice

  • 3.5

    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.

    Learning Practice

  • 3.5.1

    Mobility

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

    Learning Practice

  • 3.6

    Limitations Of Ohm's Law

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

    Learning Practice

  • 3.7

    Resistivity Of Various Materials

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

    Learning Practice

  • 3.8

    Temperature Dependence Of Resistivity

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

    Learning Practice

  • 3.9

    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.

    Learning Practice

  • 3.10

    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.

    Learning Practice

  • 3.11

    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.

    Learning Practice

  • 3.12

    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.

    Learning Practice

  • 3.13

    Wheatstone Bridge

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

    Learning Practice

  • 3.14

    Summary

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

    Learning Practice

References

NCERT Study Material

Class Notes

Memorization

What we have learnt

  • Current is the flow of elec...
  • Ohm's law states that curre...
  • Resistivity varies with mat...

Final Test

Revision Tests