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The current is the equivalent for every single cross-sections of a conductor of non-uniform cross-area. Like the water stream, charge flows faster where the conductor is littler in cross-segment and more slow where the conductor is bigger in cross-sections , so that charge rate remains unchanged.

Basic Requirement

  • Class 12 Student

Skills Covered

  • Ohm's Law

  • Kirchoff's Current Law

Expert Review

Current Electricity Chapter 3 Notes for Class 12 Physics

The essential topics from Chapter 3 Physics Class 12 notes must be understood thoroughly by the students. Current Electricity Class 12 Notes include the following topics:

Electric Current

The students will have the opportunity to review the basics of Electric current, which includes the definition and the equation. Also, after reading this section, students will be able to recognize that electric current is a scalar quantity.

Current Carriers

We have discussed current carriers in different media, such as solids, gases, and liquids. Students will be able to comprehend how current flows in each of these mediums, for example.

Drift Velocity

Using easy-to-understand language, I have explained what drift velocity is as well as how it is calculated. Students can also learn about relaxation time, the relation between current and drift velocity, and mobility within this section of Current Electricity Class 12 Notes.

Ohm’s Law

One of the essential laws of Physics is Ohm's law, and this topic from Current Electricity Class 12 Notes helps a student revise it. Current flowing through a conductor is directly proportional to the potential difference across the conductor's ends. This section of Physics Chapter 3 Class 12 Notes also shows how this law is derived step by step.

Electrical Resistance

This section will review various aspects of electrical resistance. This section of Ch 3 Physics Class 12 notes covers terms such as resistivity, conductivity, and stretching of wire.

Current Density, Conductance and Electrical Conductivity

In this segment, students will encounter concepts such as conductors, insulators, semiconductors, etc. Furthermore, this part also discusses how the resistance of metals increases with heat and that of insulators and semiconductors decreases with increasing temperatures. We have also discussed the operation of a non-ohmic device with a diagram in this section of Current Electricity Class 12 Notes.

Color Code for Carbon Resistors

There is a table in this section of Current Electricity Class 12 Notes that shows different types of carbon resistors and their colors. The students will have an easier time remembering the resistor color.

Combination of Resistors

Using equations, we have discussed the main differences between resistance in parallel and resistance in series. Students will be able to revise the following key concepts after going through this section:

With resistance in series, the voltage of a resistor is directly proportional to its resistance.

All resistors carry equal current.

Current passing through parallel resistance is inversely proportional to the resistance.

These and other fundamental concepts can be reviewed through Class 12 Physics Current Electricity Notes.


Using these notes for Physics Class 12 Chapter 3, students will study about cells, which convert chemical energy into electrical energy. This section of Notes of Chapter Current Electricity Class 12 also contains graphs of an electric cell in various positions in addition to describing terms like electromotive force, potential difference, and internal resistance.

Electric Current

Students can better understand the electric current by understanding the electric current equation. In addition, terms such as current due to transitory motion, rotatory motion of charge, and current carriers will be revised. From current electricity Class 12 notes, you will also find graphical representations of various types of current.

Kirchhoff’s Law

An algebraic representation of an example where currents meet at a junction in a closed circuit can be found in this law. Such currents sum to zero.  Additionally, students will learn how Kirchhoff's first law supports the law of conservation of charge, as well as his second law supporting the law of conservation of energy.

Heating Effect of Current

Class 12 Physics Chapter 3 Current Electricity Notes includes a section on electric current's heating effect. Students will need to be familiar with the following terms, however, in order to understand the equation. These include:

Electrical power.

Electrical energy.

Consumption of electricity.

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Course creator

                                 Yogesh P

Yogesh P

I Am School Teacher having more than 12 years of experience subject of Physics in ICSE and CBSE Schools. Also, I have done M.Sc., B.Ed. And presently pursuing post-graduation diploma in school leadership and Management. 

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