Alternating Current is one of the most practical and high-scoring chapters in the Class 12 Physics syllabus. From home electricity to industrial machines, the concept of AC (Alternating Current) powers our everyday life. This chapter is not just theory-heavy but also includes several key derivations and numericals based on LCR circuits, resonance, and transformers. To support your preparation, we are offering detailed and fully solved NCERT solutions for Class 12 Physics Chapter 7 – Alternating Current, based on the latest 2023–24 syllabus.

All solutions are prepared topic-wise, strictly following the NCERT textbook and CBSE exam pattern. You can scroll below to find solutions for each exercise or choose to download the complete PDF for offline use.

Overview of Chapter 7 – Alternating Current

This chapter introduces students to the behavior of circuits when powered by alternating voltages, rather than constant DC supplies. It explains how AC changes direction and magnitude periodically and how components like resistors, capacitors, and inductors behave under these changing conditions.

Key concepts covered include:

• AC voltage and current equations

• Peak and RMS values of AC

• Reactance and impedance of circuits

• Phasor diagrams and analysis

• Series LCR circuit and resonance

• Power in AC circuits

• Quality factor and bandwidth

• Transformer working principle and applications

Each section is supported with practical examples and mathematical derivations, ensuring students understand both the conceptual and computational parts of the chapter.

Why Use These NCERT Solutions for Chapter 7?

The chapter on Alternating Current includes complex formulas and requires a good grasp of trigonometry and calculus to solve numerical problems effectively. Our Class 12 Physics NCERT solutions for Chapter 7 make it easier to understand the logic behind every derivation and solution.

Here’s how our solutions help:

• All textbook questions are answered clearly and correctly

• Step-by-step method for numerical and theoretical problems

• Key derivations such as impedance, resonance, and power factor explained in depth

• Designed to match the CBSE marking scheme

• Written in easy-to-understand language, ideal for board exam preparation

Whether you are revising for your school exam or preparing for JEE/NEET, these solutions will help reinforce your understanding of alternating current and its applications.

Class 12 Physics Solutions Download PDF – Chapter 7

For convenience, students can also download Class 12 Physics Chapter 7 NCERT solutions PDF directly from our website. This is perfect for offline study or quick revision before tests. The downloadable PDF includes all exercises and in-text questions answered in an organized format.

You can carry it on your phone, laptop, or print it out for regular practice sessions.

What You’ll Learn in This Chapter

By the end of Chapter 7, students will have a deep understanding of:

• How current and voltage behave in AC circuits

• The role of inductance and capacitance in frequency response

• Calculating impedance and phase angle using phasors

• Determining power consumption in resistive, capacitive, and inductive circuits

• Using transformers for voltage regulation in power transmission

These topics are not just relevant for board exams but are also foundational in higher studies, especially for students pursuing engineering and electronics.

Access Complete NCERT Solutions for Chapter 7 Below

All questions from the NCERT textbook for Class 12 Physics Chapter 7 – Alternating Current have been solved by experts and listed below. You can browse them section-wise or choose to download the full PDF version.

These solutions are aligned with the official Class 12 Physics books prescribed by CBSE and are updated for the current academic year.

Explore the complete solutions below and take your understanding of AC circuits to the next level.