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Important Questions for Class 12 Physics Chapter 3 Current Electricity - PDF Download

Class 12

In terms of physics, chapter 3 on current electricity is both important and exciting. As a result, it is crucial for the students to have current electricity class 12 vital questions prepared. These solutions will enable students to fully comprehend the chapter with clarity and precision.

These important questions can be downloaded fromeSaral where expert teachers curate the entire content by verifying it with the guidelines and patterns followed by the CBSE board. You can excel in this chapter and score better marks by following the study materials containing the physics chapter 3 class 12 important questions. It will also help you to create notes from the chapter based on the relevant problems. 

Important Topics & Sub-topics of Current Electricity Class 12 Physics

Here, on this website you can get important questions and its solution in pdf format for class 12 chp 3 Current Electricity, which is basically about Electrostatic potential and capacitor and capacitance. Be careful that the topics may vary depending on your curriculum and textbook, the table is being created based upon a sample question paper discussed internally in the coaching center. 

In Class 12 physics, the chapter on "Current Electricity" is an important one. Below are the important topics and subtopics within this chapter

Electric Current

  • Definition and concept of electric current

  • SI unit of current (Ampere)

  • Direction of current flow (conventional vs. electron flow)

Electric Current in Conductors

  • Conductors, insulators, and semiconductors

  • Ohm's Law and its mathematical representation (V = IR)

  • Resistance (R), its dependence on length, cross-sectional area, and resistivity (ρ)

  • Temperature dependence of resistance

  • Factors affecting resistance

Electric Cells and EMF

  • Primary and secondary cells

  • EMF (Electromotive Force) and internal resistance

  • Combination of cells in series and parallel

  • Grouping of cells in battery

Kirchhoff's Laws

  • Kirchhoff's current law (KCL) - Conservation of charge

  • Kirchhoff's voltage law (KVL) - Conservation of energy

  • Application of Kirchhoff's laws in solving complex circuits

Electrical Resistivity and Conductivity

  • Definition of resistivity (ρ) and conductivity (σ)

  • Relationship between resistance, resistivity, and dimensions

  • Conductance (G) and its relation to resistance

Electric Power and Energy

  • Electrical power (P) and its formula (P = IV or P = I²R)

  • Electrical energy (E) and its relation to power and time (E = Pt)

  • Commercial unit of electrical energy (kilowatt-hour, kWh)

Combination of Resistors

  • Series and parallel combinations of resistors

  • Calculation of equivalent resistance for series and parallel combinations

  • Applications of series and parallel combinations in circuits

Heating Effect of Electric Current (Joule's Law)

  • Relationship between electrical power and heat produced

  • Joule's law and its applications

These topics and subtopics cover the fundamental concepts of current electricity in Class 12 physics. It's essential to understand these concepts thoroughly, as they serve as the foundation for more advanced topics in electrical circuits and electronics.

Class 12 Physics Chapter 3 Electric Current Weightage

In last year's question paper 2023 class 12 physics, This paper contained 2 MCQs questions and each question for 1 mark and 2 questions were in section B and in this section questions were for 2 marks  and 1 numerical question came from this chapter. As this is a very easy chapter so you can score well in this unit.

Tips to Solve Class 12 Physics Chapter 3 Current Electricity

Solving problems related to Class 12 Chapter 3 on "Current Electricity" can be made more manageable with these tips:

Understand the Concepts: Before attempting problems, make sure you have a clear understanding of the fundamental concepts in the chapter. Review the theory and definitions, such as Ohm's Law, Kirchhoff's Laws, and concepts related to resistors, cells, and circuits.

Practice Regularly: Practice is crucial in mastering this chapter. Start with basic problems and gradually move to more complex ones. Focus on solving a variety of problems to build your problem-solving skills.

Draw Circuit Diagrams: Draw circuit diagrams for the problems you encounter. Visualization can help you better understand the circuit and the flow of current.

Apply Ohm's Law: Ohm's Law (V = IR) is fundamental in current electricity. Whenever you encounter a problem involving voltage, current, and resistance, use this equation as a starting point.

Use Kirchhoff's Laws: Understand how to apply Kirchhoff's Laws (KCL and KVL) to analyze complex circuits. These laws are invaluable for solving circuit problems.

Simplify Circuits: Break down complex circuits into simpler sub-circuits. Solve each sub-circuit separately, and then combine the results to find the solution for the entire circuit.

Be Systematic: When solving problems, work systematically. Start by listing known quantities, label all circuit elements, identify the unknowns, and plan your approach before performing calculations.

Unit Analysis: Pay attention to units while solving problems. Ensure that the units of your answers match the expected units. This can serve as a helpful check.

Check for Consistency: Verify that your solutions are consistent with physical principles. For example, ensure that the current entering and leaving a junction is balanced (KCL) and that the sum of potential differences in a closed loop is zero (KVL).

Practice with Previous Papers: Solve previous years' question papers and sample papers. This will give you a sense of the types of questions that may appear in your exams.

Time Management: Practice time management when solving problems. Allocate a specific amount of time to each problem, and if you find yourself spending too much time on one, move on and come back later.

Remember that practice and understanding the underlying principles are key to success in solving problems related to current electricity in Class 12 physics. Start with simple problems and gradually work your way up to more complex ones as you build your confidence and skills.

Benefits of Solving Class 12 Physics Chapter 3 Important Questions with Answers 

Solving Class 12 Physics Chapter 3 on "Current Electricity" offers several benefits, both academically and conceptually:

Understanding Fundamental Concepts: Solving problems in this chapter helps you grasp fundamental concepts like Ohm's Law, Kirchhoff's Laws, resistance, current, voltage, and power. This understanding is essential not only for your exams but also for future studies in physics and engineering.

Problem-Solving Skills: Physics problems often require analytical and critical thinking. Solving these problems enhances your problem-solving skills, which can be valuable in various academic and real-world scenarios.

Application of Theoretical Knowledge: It allows you to apply theoretical knowledge to real-world situations. You learn how to analyze electrical circuits and calculate various parameters, which is applicable in electrical engineering and practical life.

Preparation for Exams: Regular practice with problems in this chapter prepares you for your Class 12 exams. It helps you become familiar with the types of questions that may appear and improves your ability to solve them effectively.

Conceptual Clarity: Working through problems reinforces your conceptual clarity. It's one thing to read about electrical circuits and another to actually apply the principles to solve problems. This deepens your understanding.

Critical Thinking: Physics problems often require creative thinking and the ability to think critically. This chapter helps you develop these skills, which are valuable beyond the realm of physics.

Real-Life Application: The concepts of current electricity are not limited to the classroom. They have practical applications in various fields, from electronics to power distribution, making this knowledge useful in everyday life.

Improved Numerical Skills: This chapter is rich in numerical problems, helping you improve your numerical and mathematical skills.

Better Time Management: Solving physics problems requires effective time management. It teaches you how to allocate time to different types of problems and work efficiently.

Frequently Asked Question

Question : 1 What are the different topics covered in Chapter 3 of Class 12 Physics?

Answer: The various topics covered in Class 12 Chapter 3 Physics are following:

  • Electric current

  • Electric currents in conductors 

  • Ohm’s law

  • Drift of electrons and origin of resistivity

  • Limitations of Ohm’s law

  • Resistivity of various materials

  • Temperature dependence of resistivity

  • Electrical energy, power

  • Combination of resistors - series and parallel

  • Cells, emf, internal resistance

  • Cells in series and parallel

  • Kirchhoff’s rules

  • Wheatstone bridge

  • Meter bridge

  • Potentiometer

Question 2 : What is the name of Chapter 3 of Class 12 Physics?

Answer: The name of the 3rd chapter in Class 12 physics is ‘Current Electricity’. This chapter is very important, as it has many important topics. It c.