NCERT Solutions for Class 12 Physics Chapter 3 – Current Electricity

NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity contain all the major topics that have been covered in the chapter. These NCERT solutions assist you in ensuring that you are well prepared for your exams and have a thorough practice of all the questions that have been included in the chapter along with the fundamentals that have been used to solve them. Topics like resistance, Wheatstone bridge, potentiometer, circuit diagrams, potential difference etc. have been introduced in the chapter. 

NCERT Class 11 Physics Chapter 3 comprises a total of 24 questions. These are all based on the core concepts of the chapter and revolve around the fundamentals, mathematical expressions and formulas that have been included in it. There are short answer theory questions, observational questions and a majority of numerical based questions. 

The NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity by Instasolv, aim at ensuring that all your doubts are resolved at one place and you’re not stuck in the chaos of finding various resources. Instasolv believes in eliminating all the unnecessary stress from your study curriculum and replace it with a comfortable, productive and impactful learning environment. With our solutions and your efforts, nothing can stop you from scoring well in your exams.

Important Topics for NCERT Solutions for Class 12 Physics Chapter 3 – Current Electricity

OHM’s Law 

Ohm’s law is an important topic of CBSE Class 11 Physics syllabus. In NCERT Solutions for Class 12 Chapter 3, you will learn that in case of a conductor, through which the Current flowing is denoted by me and the Potential Difference between its ends is denoted by V. The OHM’s law for the conductor states that V is directly proportional to I or V = IR. 

Here R is the constant of proportionality and is termed to be the Resistance of the conductor. The SI unit of Resistance is OHM and is denoted by the symbol ‘Ω’. The resistance of a conductor depends on two major factors – namely, the dimension of the conductor and the material out of which the conductor is made. 


The conductivity of a conductor is due to the mobility of the charge careers in it. In the case of metals, it is the electrons which are termed as the charge carriers and in case of ionized gas, it is electrons and the positively charged ions. In the case of an electrolyte, these can tend to be both positive and negative ions. The SI unit of mobility is m2

Parallel and Series Combination of Resistors

The chapter will introduce you to the various ways in which the resistors are connected, either in series or in combination and at times in a mixed combination of both parallel and combination. In case of a series combination, the calculation is done normally whereas in case of a parallel combination the values are reciprocated while calculating. 

Exercise-Wise Discussion of NCERT Solutions for Class 12 Chapter 3 – Current Electricity

Chapter 3 Current Electricity contains one exercise and twenty-four questions in total. All the questions are given in the chapter revolve around the basic and core concepts that have been tackled in it. All of these exercise questions will help you brush up your analytical and application skills, through different problems and chapter-based solutions. 

The first exercise begins with a simple formula based question where you are asked to find out the temperature coefficient of a silver wire based on the resistivity that is mentioned in the problem. The questions following it are also similar, like question 3.8 where again you are required to find the steady temperature, with different conditions and a more complex approach. These questions are important for CBSE board exams.

The chapter also has diagram-based questions where you are required to find the current, resistance and potential or either of them based on the conditions that are given in the question. For example, question 3.9 where you are given a series and parallel arrangement from which you are required to find the current flowing in the circuit. 

The question 3.10 deals with a meter bridge; this again is a very important topic that you will learn in the chapter. With certain given values you will be required to find the resistance of the meter bridge.

There are some observation-based questions, like question 3.17, where you are given various recordings of a resistor in terms of current and voltage, and you are required to write what you understood from the same. Question 3.18 and 3.19 are also theory-based questions which require a short answer

Benefits of NCERT Solutions for Class 12 Physics Chapter 3 – Current Electricity

Instasolv’s team of expert and experienced professionals have left no stone unturned in covering each and every question from the chapter. All the solutions have been organized in a step by step and student-friendly manner, for your independent learning. The solutions have been formulated in accordance with the latest CBSE Syllabus. The most remarkable fact about Instasolv’s NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity, is that they are free to access at any time.