Revision Notes for CBSE Class 12 Physics Chapter 3 (Current Electricity) - Free PDF Download
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FAQs on Current Electricity Class 12 Notes CBSE Physics Chapter 3 (Free PDF Download)
1. What is the Main Difference Between Conductors, Semiconductors and Insulators?
The main difference between insulators and conductors is that the electrical conductivity of the former is very nil or zero in most cases. On the other hand, materials that can conduct charges are known as conductors while those that conduct charges in a restrictive manner are semiconductors.
2. What are the Two Main Types of Resistance?
There are two main types of resistors. This includes resistance in series and resistance in parallel. In case of resistance in series, the same amount of current flows through each resistor whenever there is any change. On the other hand, in a parallel resistor, the difference among each resistor stays the same. Furthermore, the difference is also equal to the applied difference.
3. What is the Main Difference Between Kirchhoff’s First and Second Law?
Kirchhoff's first law supports the law of conservation of charge, whereas his second law supports the law of conservation of energy. This is the main distinction between the two laws. Moreover, whereas the second law is employed in closed circuits, the first law is applied in both open and closed circuits.
4. What is the current electricity and where can I find the PDF of its solutions?
The movement of electrons from one point A to point B in a circuit is known as electricity. When two different points are connected through a wire, free electrons flow through them and this is called the current. The electricity is measured in amperes. You can find and/or download the PDF from the official site of Vedantu for free. The PDF file for Physics Class 12 is available and accessible to every student free of cost. You can also find the PDF on Vedantu’s learning app.
5. What is the electric current according to Chapter 3 of Class 12 Physics?
Electric current is a prominent concept in the modern era and is used consistently in our daily life. Electric current is used in the operation of even the most basic gadgets. The rate at which an electric charge moves through a space in a unit of time is known as electric current. An electric current is a movement of charged particles because charged particles carry electric charge. Electric current is measured by an ammeter. Electric current is measured by the unit ‘ampere’.
6. What is drift velocity?
The average velocity at which the electrons drift towards the positive end of the conductor in the presence of an electric field is drift velocity. The unit of drift velocity is measured by m/s. This drift velocity or speed is what contributes to the electric current. You can find step by step explanation of drift velocity in NCERT solutions for Class 12 Physics Chapter 13. You can find related examples, graphs etc., which will help you to understand the concept of drift velocity better.
7. What is superconductivity?
The absence of resistance in various metals when they are cooled below a characteristic temperature completely is known as superconductivity. This temperature transition differs from metal to metal but generally is below -253 C. This phenomenon helps in the effective transition of current between two points without wasting any power of the current to heat. This phenomenon of superconductivity is used in computer chips to speed their connections, MRI machines to help doctors examine tissues inside patients’ bodies, etc.
8. Is Class 12 Physics Chapter 3 important for board exams?
Chapter 3 Current Electricity is a part of your syllabus for your first term examination. Chapter 3 current electricity is essential for the preparation of the exam and might pique your interest too. This chapter is significant for Class 12 students to learn as it will be helpful in competitive exams. You can download NCERT Solutions for Chapter 3 current electricity from the Vedantu as well as other necessary study material such as revision notes, assignments, important topics, a summary of all chapters, etc.