NCERT Books Free Download for Class 12 Physics Chapter 7 - Alternating Current

Q: 1. Is NCERT alone sufficient to pass the CBSE 12th board exam?

As a student myself and have passed my CBSE 12th Board exam, I can assure you that thorough revision of NCERT textbooks is sufficient enough to not only pass but get good grades in the CBSE Board exam. NCERT books make your fundamental knowledge strong enough to answer various types of questions asked in the final examination, short notes and important points jotted down by students from NCERT textbooks plays a vital role during the final time preparation of the exam. Apart from that, solving the unsolved questions available at the end of each chapter enables students to get a firm grip on various fundamental concepts and exposes students to various categories of questions being asked in examination patterns.

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Class 12

Physics

Chapter 7:

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Alternating Current Free PDF Download

Free NCERT Books download for Class 12 Physics Chapter 7 - Alternating Current on Vedantu.com. Students can also download the NCERT Textbooks Solutions in PDF for Class 6 to 12 all subjects. Register for Physics tuition to clear your doubts and score more in your exams.

For a very long time period the current source was only direct current but with improvements and more experimentation came the knowledge of alternating current. The flow of current reverses over a period of time. Just like waves, alternating current consists of a period, frequency of current as well as the amplitude of the alternating current.

This chapter in NCERT deals with a brief introduction about alternating current followed by AC voltage and its applications when connected with resistors, inductors, capacitors, phasors, and a series of LCR circuits. Various experiments were undertaken to explain the functioning of AC voltage and its applications in transformers.

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More Free Study Material for Alternating Current

Ncert solutions

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Revision notes

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Important questions

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Outline For NCERT Class 12 Chapter 7

The topics included in the chapter are:

7.1- Introduction

7.2- AC Voltage Applied to a Resistor

7.3- Representation of AC Current and Voltage by Rotating Vectors — Phasors

7.4- AC Voltage Applied to an Inductor

7.5- AC Voltage Applied to a Capacitor

7.6- AC Voltage Applied to a Series LCR Circuit

7.7- Power in AC Circuit: The Power Factor

7.8- LC Oscillations

7.9- Transformers

List of Sample Questions

About NCERT

Established in the year 1961 The National Council of Educational Research and Training (NCERT) is an autonomous organization, which focuses mainly on providing qualitative education in primary and secondary levels of the education system.

It deals with the preparation and publication of textbooks, study materials in form of newsletters, journals and multimedia digital materials.
Apart from providing material, it deals with developing and spreading of innovative ideas regarding teaching techniques and aids in providing training to newly appointed staff.
It as an organization collaborates with state educational institutions, various universities and non-governmental organizations working in the field of imparting education.
NCERT acts as a nodal, for achieving the goal of basic elementary education, apart from the state education system.
NCERT not only plays an important role in the Indian education system but also maintains its cultural relationships with other countries and facilitates the foreign exchange of students.

Preparing the Chapter

Here you can read Chapter 7 of the Class 12 Physics NCERT Book. Also after the chapter, you can get links to Class 12 Physics Notes, NCERT Solutions, Important Question, Practice Papers etc. Scroll down for Alternating Current from NCERT Book Class 12 Physics Book & important study material.

It is easy to download the NCERT Class 12 Books. Just click on the link, a new window will open containing all the NCERT Book Class 12 Physics pdf files chapter-wise. Select the chapter you wish to download and it's done. You will have the PDF on your device to study offline.

The chapter alternating current teaches about electric current, which periodically changes its magnitude and reverses its direction with time unlike Direct Current (DC), which flows only in one direction. In the Alternating Current Class 12 NCERT Solutions, students learn the basics of current that varies like a sine function with time as its value oscillates between the maximum and minimum.

This alternating current class 12 broadly explains how electric energy is transformed into AC, which can be controlled by a transformer. This makes an easy flow of power through the power lines even at high voltage.

Important Bullet Points For The Chapter:

Alternating current is the current that varies as a sine function with time. As we know the value of the sine function has the range of -1 to 1 the same goes for the value of current that oscillates between the maximum and minimum value.
Unlike Direct current the value of Alternating current changes with time. The direction of current is both clockwise and anticlockwise and keeps on periodically occurring.
The frequency of the Alternating Current depends directly on the electron's movement and the changes in the direction of the electron’s movement.
AC current is generated due to AC voltage.
Alternating current comes into action when a magnet that is in motion is concerned instead of a steady magnet.

Alternating current is an important chapter in Class 12 physics, this chapter along with Electromagnetic Induction contributes to 17 marks in the total. which is around a quarter of the total and hence is a very important chapter. In the previous few years consistently there have been two questions from this chapter in JEE Mains and hence contributes to 6.6 % in the total mark distribution.

FAQs on NCERT Books Free Download for Class 12 Physics Chapter 7 - Alternating Current

1. Is NCERT alone sufficient to pass the CBSE 12^th board exam?

As a student myself and have passed my CBSE 12^th Board exam, I can assure you that thorough revision of NCERT textbooks is sufficient enough to not only pass but get good grades in the CBSE Board exam. NCERT books make your fundamental knowledge strong enough to answer various types of questions asked in the final examination, short notes and important points jotted down by students from NCERT textbooks plays a vital role during the final time preparation of the exam. Apart from that, solving the unsolved questions available at the end of each chapter enables students to get a firm grip on various fundamental concepts and exposes students to various categories of questions being asked in examination patterns.

2. From where can I download the 12th NCERT physics book?

Here on Vedantu, we provide you with a cost-free, easy download link for NCERT textbooks. Along with that, we provide some easy-to-understand revision notes for end time revision and sections of important questions to refer to. You can find the textbook pdf available on our website or app, and you can download it at your convenience. In case of your doubts regarding NCERT unsolved questions, we provide you with a professional’s guidance too. These hyperlinks for downloading the textbooks are a user-friendly 1 step way to download PDFs. In case any assistance is required, we are here at your service at Vedantu.

3. How can I make notes from NCERT textbooks?

Note making is a technique that serves as crucial during final exam preparation. As students you should be able to grasp the fundamental concept being taught in NCERT books, this does not mean that you can copy phrases/ lines written in the textbook as it is. You will have to go through the book thoroughly followed by which a better understanding of the said topic can be made and henceforth theoretical notes can be prepared, based on what the student felt important to remember.

Apart from this, a separate small notepad could be maintained containing all the numerical formulas and standard units of various terms used in physics which, when organized in a systematic manner, are easy to grasp and save a lot of time for students at the endpoint, when shuffling pages of textbooks doesn’t seem like a feasible option.

4. NCERT Books Free Download for Class 12 Physics Chapter 7

Students who are in class 12th or preparing for any exam which is based on Class 12 Physics can refer to the NCERT Physics Book for their preparation. Digital NCERT Books Class 12 Physics PDF are always handy to use when you do not have access to a physical copy.