Skip to main content

CBSE Class 12 Physics Online Notes-Current Electricity

CBSE Class 12 Physics Online Notes-Current Electricity

Takshilalearning offer animated courses with live classes as per the CBSE syllabus. Our main objective is to provide quality and result oriented education as well as guidance to the students’ perusing various courses, in order to achieve their goals.
Class 12 Physics: The flow of electric charge through an electric called an electric current.  Electric current is basically caused by the flow of electrons or ions. It is denoted by I and its SI unit is ampere. Basically, we can say an electric Current is flow of charge in coulomb per second through any closed circuit. Thus, we have
I=Q/T, where Q is the amount of charge flowing through a circuit in time period T. Ammeter is the device used to measure electric current. Electric current is a scalar quantity though it has magnitude as well as the direction it does not follow the vector law of addition that’s why it is considered as the scalar.
OHMS LAW:
According to OHM’s Law, the electric current flowing through any conductor between any two points is directly proportional to the potential difference across those two points, that proportionality constant is resistance and the given equation is
I=V/R
Where ‘I’ is the current flowing through that conductor, V is the potential difference measured across the conductor, R is the resistance of that conductor and their SI units are amperes, Volts and Ohms respectively. The basic point of ohms law is that resistance R is the relation between the current flowing through the circuit and the potential difference across the terminals.
CURRENT DENSITY:
Current density is the measure of the density of an electric current. It is defined as the flow of electric current per cross-sectional area. It is a vector quantity. Its SI unit is amperes per square meter.
I = ∫ Ĵ.dÂ
Where ‘I’ is current in the conductor, Ĵ is the current density and d is the differential cross-sectional area vector. The current density is directly proportional to the to the electric field in that particular medium and relation between the electric field and current density is obtained with the help of conductivity(σ) of the material. Hence, we can say,
Ĵ=σÊ
The reciprocal of conductivity is called as resistivity which is denoted by ρ and the above equation can be written as
Ĵ=Ê/ρ
Ê=Ĵρ
or more inquires about Physics notes class 12, regular articles of 12th Physics on various topics , 12th Science, NCERT solutions class 12th, CBSE guide, sample papers, latest updates from CBSE Board, Enroll with TakshilaLearning
Labels:

Comments

Post a Comment

Thank you we will contact ASAP.

Popular posts from this blog

Why is Hindi Day celebrated on 14 September?

Why is Hindi Day celebrated on 14 September? After independence, the Government of India set a goal to give an ideal form to the mother tongue of the country and set a target for grammar and orthography using the Devanagari script to bring standardization in writing. Subsequently, on September 14, 1949, the Constituent Assembly decided by a vote that Hindi would be the official language of India. To propagate the importance of this decision and to spread Hindi in every region, India is celebrating Hindi Day every year from 1953 to 14 September, at the request of Rashtrabhasha Prachar Samiti, Wardha. Apart from this, 14 September is also the birthday of Rajendra Singh, who worked tirelessly to make Hindi the official language of India. Hindi Day is observed every year on 14 September to mark the importance of the Hindi language in the country. The Hindi language is one of the oldest languages, which derives most of its academic vocabulary from the Sanskrit language written in the Deva
Post a Comment
Read more

Magnetic and non-magnetic material Class 6 Science

Magnetic and non-magnetic material  Class 6 Science A magnet is a substance that is drawn to certain magnetic materials like iron, cobalt, and nickel. Magnets have the ability to draw iron to them. Natural magnets are rocks that naturally draw iron. Non-magnetic materials include things like wood, rubber, coins, feathers, leather, etc. that are not drawn to iron. Magnet characteristics It pulls magnetic materials, such as iron. The magnet's two ends are referred to as its poles. The magnet's diametrically opposed poles are drawn together. Heating, hammering, or dropping causes it to lose its characteristics. On the basis of properties types of Magnets Temporary magnets are those magnets that are magnetic for only a little duration. Typically, iron, cobalt, or nickel are used to make them. When they are close to the powerful magnet, they act like a magnet. When they are yanked away from the powerful magnet, they stop being magnetic. Permanent magnets are magnets that have magne
Post a Comment
Read more