Current electricity class 12

Current Electricity Class 12 Notes Chapter 3 1. The directed rate of flow of electric charge through any cross-section of a conductor is known as electric current. If ∆Q charge flows in time ∆t, then current at any time t is NOTE: Current is a scalar quantity. I is in the direction of flow of positive charge and opposite to the direction of flow of negative charge. SI unit of current is ampere and is represented by A. 2. The current density at a point in a conductor is the ratio of the current at that point in the conductor to the area of cross-section of the conductor at that point provided the area is held normal to the direction of flow of current. NOTE: Current density is a vector quantity. 3. Flow of Electric Charge in Metallic Conductors Among the solids, all metals are good conductors of electricity. The cause of conductance is free electrons. In Case of a Solid Conductor (i.e. Cu, Fe, Ag, etc) atoms are tightly bound to each other. There are large number of free electrons in them. In Case of a Liquid Conductor Like electrolytic solution, there are positive and negative charged ions which can move on applying electric field. 4. Drift Velocity It is defined as the average velocity with which the free electrons move towards the positive end of a conductor under the influence of an external electric field applied. 5. Electric current in terms of drift velocity 6. Current density at any point of conductor, j = nev d where, j is a vector quantity. 7. Mobility The ratio o...

HCL TechBEE 2023 Registration Open - Apply Now! NCERT Book for Class 12 Physics Chapter 3 Current Electricity is available for reading or download on this page. Students who are inclass 12thor preparing for any exam which is based onClass 12 Physics can referNCERT Physics Bookfor their preparation. DigitalNCERT Books Class 12 Physics pdf are always handy to use when you do not have access to physical copy. Here you can readChapter 3 of 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 forCurrent Electricity from NCERT Book Class 12 Physics Book& important study material. NCERT Book Class 12 Physics Chapter 3 Current Electricity Download NCERT Book for Class 12 Physics PDF It is easy to download theNCERT Class 12 Books. Just click on the link, a new window will open containing all theNCERT Book Class 12 Physics pdf files chapter-wise. Select chapter you wish to download and its done. You will have the PDF on your device to study offline. • Buy NCERT Book for Class 12 Physics Online You can buyClass 12 Physics NCERT Bookfrom various online platforms and get doorstep delivery in no time. For your convenience, we have curated direct link toNCERT Book Class 12 Physics so that you need not to keep search for it. You can simply visit the link to go to amazon website and order online. • NCERT Solutions for Class 12 Physics After reading the chapter, you can refer t...

If you are 12th class students who are looking for Physics Investigatory Project Class 12th? If yes, then you are at the right place. Here in this post, we have provided a list of best physics investigatory project class 12. In this way, students can choose the Physics is one of the most popular branches of science that deals with the properties of matter and energy, the structure of matter. The main subject matter of physics includes heat, light, mechanics, and other radiation, the structure of atoms, sound, magnetism, and electricity. Physics is the branch of science that creates plenty of career opportunities. • • • • • • • • • • Latest Physics Investigatory Project Class 12 CBSE Students Physics Investigatory Project Topics on Current Electricity Below is the list of Physics Investigatory Project Topics on Current Electricity: • Motion sensing lights and fans to save electricity • To Study the Light Dependent Resistor • To Study the Moving Coil Galvanometer • To Study Temperature effect on resistivity of Insulators • Analytical Study of Drift Velocity in the Low Dimensional Devices • To Study the Charging and Discharging of Capacitors in R-C Circuits • To Study, the Wheatstone Bridge Circuit Working with its Application • To Investigate the new Emerging Electricity Generating Techniques • To Study the Tangent Galvanometer: an investigatory project in physics for class 12 • To Study, the Variation in Current Flowing in A circuit Containing an LDR, Because of Variation P...

LPU (Ranked #1) 2023 Application - Apply Now! Class 12 Physics Current Electricity – Get here the Notes for Class 12 Physics Current Electricity . Candidates who are ambitious to qualify the Class 12 with good score can check this article for Notes. This is possible only when you have the best CBSE Class 12 Physics study material and a smart preparation plan. To assist you with that, we are here with notes. Hope these notes will helps you understand the important topics and remember the key points for exam point of view. Below we provided the Notes of Class 12 Physics for topic Current Electricity. • Class: 12th • Subject: Physics • Topic: Current Electricity • Resource: Notes CBSE Notes Class 12 Physics Current Electricity Candidates who are pursuing in Class 12 are advised to revise the notes from this post. With the help of Notes, candidates can plan their Strategy for particular weaker section of the subject and study hard. So, go ahead and check the Important Notes for Class 12 Physics Current Electricity . Electric Current (I) The rate of flow of charge through any cross-section of a wire is called electric current flowing through it. Electric current (I) = q / t. Its SI unit is ampere (A). The conventional direction of electric current is the direction of motion of positive charge. The current is the same for all cross-sections of a conductor of non-uniform cross-section. Similar to the water flow, charge flows faster where the conductor is smaller in cross-section ...

Formula booklet physics class 12 chapter Current Electricity Current Electricity formula are listed below: The rate of charging flow in any part of the wire is called the electric current flowing through it. Electric current (I) = q / t. Its SI unit is ampere (A). Conventional electrical current direction is the direction of the positive charge motion. The current is the same for all non-uniform cross-section conductor sections. Similar to water flow, charging flows faster when the conductor is small in the opposite direction and slows down when the conductor is more extensive in the cross-section so that the charging level remains unchanged. When charging, q revolves around a circle with frequency f, equal power, i = qf (Metallic conductor current flows due to free electrons' motion while electrolytes and ionized gases flow now due to electrons and directions.) Types of Electric Current According to both magnitude and direction electric current is of two types • Direct Current (DC) Its magnitude and direction do not change over time. A ceil, battery or DC dynamo are the most direct current sources. • Alternating Current (AC) An electric current whose magnitude change continuously and change its direction from time to time is called alternating current. The AC dynamo is a current exchange source. • Resistance R= V/i Where I = Strength of current i = current • Variati​on of resistance with temperature: R = R0(1 + αΔT) Where-R t-resistance at temperature t°C, R 0-resistance ...

Important Derivations for CBSE Class 12 Physics Physics can be a scary ordeal for some and a very interesting subject for the rest. There are many scholars who want a program or some tips about important topics that support and help them in studying physics. With a proper preparation strategy, an idea about the important questions, derivations, and formulas in physics, a student can definitely score well in the main physics exam. Here we would like to provide the important derivations of CBSE class 12 List of Physics Derivations \(\begin \) • Electric field intensity due to a uniformly charged spherical shell at various points • The capacitance of a parallel plate capacitor with a dielectric medium • The capacitance of a parallel plate capacitor without dielectric medium • Electric potential due to a point charge – \(\begin \) Current Electricity(Unit 2) • Application of Gauss theorem in the calculation of electric field intensity due to thin infinite plane sheet of charge uniformly charged spherical sphere • The relation between current and drift velocity • An expression for drift velocity • Series and parallel connection of resistors Magnetic Effect of Current and Magnetism(Unit 3) • Torque experienced by a current loop in a uniform magnetic field • Ampere’s law and its application to an infinitely long straight wire. Straight and toroidal solenoids. • The magnetic dipole moment of a revolving electron • Apply Biot-Savart law to derive the expression for the magnetic...

Important Questions for Class 12 Physics Chapter 3 Current Electricity Class 12 Important Questions Current Electricity Class 12 Important Questions Very Short Answer Type Question 1. The plot of the variation of potential difference across a combination of three identical cells in series, versus current is as shown in the figure. What is the emf of each cell? (Delhi 2008) Answer: Total emf of three cells in series = P.D corresponding to zero current = 6V ∴ The emf of each cell = \(\frac\) The distance transversed by each electron in time (t) = drift velocity × time = V dt If we consider two planes P and Q at a distance V dt in a conductor, then the total charge flowing in time t will be equal to the total charge on the electrons present within the cylinder PQ. The volume of this cylinder = cross sectional area × length = A V dt If n is the number of free electrons in the wire per unit volume, then the number of free electrons in the cylinder = n(A V dt) If charge on each electron is -e (e = 1.6 × 10 -19 C), then the total charge flowing through a cross-section of the wire, This is the relation between electric current and drift velocity. Negative sign shows that the direction of current is opposite to the drift velocity. (b) Charge = Current × time (i) For 0 to 5 seconds, the current Hence, q 1 = (2.5) × (5) = 12.5 C (ii) For 5 sec to 10 sec, the current = 5A Hence, q 2 = 5 × (10 – 5) = 5 × 5 = 25 C q = q 1 + q 2 = 12.5 + 25 = 37.5 C (ii) (c) Electric current will remain ...