Working of transformer class 12

Step up transformer: The transformer which converts low alternating voltage at high current into high alternating voltage at low current is called step-up transformer. In step-up transformer number of turns in secondary coil (Ns) is greater than number of turns in Primary coil (Np) i.e. Ns > Np. Primary is made of thick insulated copper wire and Secondary is made of thin wire. Step-up transformer Step down transformer : (iv) Hysteresis losses: The alternating currents flowing through the coils magnetizes step up and demagnetizes the iron core again and again over complete cycles. During each cycle of magnetization and demagnetization some energy is lost due to hysteresis and is equal to area of hysteresis loop. This loss can be minimized by selecting a material of core, which has a narrow hysteresis loop.

Uses Of Transformer Transformers are used to transfer current from one circuit to another without any physical contact between them and without changing the frequency or phase. There are various uses of transformer depending on the type. Some of the most common applications are mentioned below. According to the necessity, transformers are classified into: • Power Transformers • Distribution Transformers • Measurement Transformers • Indoor Transformers • Outdoor Transformers Applications and uses of Transformers According to the necessity, transformers are classified into: Power Transformers: These kinds of transformers are used for high voltage power transfer applications (more than 33 KV). They are usually bigger in size and can occupy larger space. Distribution Transformers: These type of transformers are used to distribute the generated power to distant locations. It is used for distributing electricity at low voltage that is less than 33 KV in industry or 220-440 V for household purposes. Measurement Transformers: This kind of uses of transformer helps in measuring voltage, current, and power, etc. According to the place of use, transformers are classified into: Indoor Transformers: These are covered with roofs and shelters just like the industry types. Outdoor Transformers: These are mainly kept outside and are used as distribution type transformers. While performing a manufacturing process, chemical engineering like During steel manufacturing process, high currents a...

Source: Wikipedia As shown in the above diagram an electrical transformer consists of two coils named as the primary coil and secondary coil which is wounded on a soft iron core. The soft iron core is laminated to minimize eddy currents. Both the coil in the transformer has high mutual inductance. A mutual electro-motive force is induced in the transformer from the alternating Browse more Topics under Alternating Current • • • • • • • Induced EMF The so produced electro-motive force can be explained with the help of Faraday’s laws of Electromagnetic Induction given: $$e=-\frac= 600V$$ Q2: Why do we use a soft iron core for the construction of a transformer? Solution: This is because the hysteresis curve of a soft iron core is extremely thin and thus having less energy loss. That is whatever energy is transferred from primary to secondary coil there will be the minimum loss if we use a soft iron core.

In this doc you can find the meaning of Transformer physics project work defined & explained in the simplest way possible. Besides explaining types of Transformer physics project work theory, EduRev gives you an ample number of questions to practice Transformer physics project work tests, examples and also practice Semester Notes , practice quizzes , Free , ppt , Previous Year Questions with Solutions , Sample Paper , Summary , Exam , MCQs , shortcuts and tricks , mock tests for examination , Transformer physics project work - Class 12 , Transformer physics project work - Class 12 , Important questions , Transformer physics project work - Class 12 , Objective type Questions , pdf , study material , video lectures , Extra Questions , past year papers , Viva Questions;

Table of Contents • • • • • • • • • • • • What is a transformer? The transformer transfers the electrical power from one circuit to the other circuit without the change in frequency. The transfer happens based on the mutual induction between the two circuits that are linked by a magnetic flux. A transformer has two inductive coils that are electrically separated from each other but are magnetically linked through a path for the flow of magnetic flux. Transformers vary in different sizes and ranges. It ranges from small transformers used in the communication system to giant transformers used in the High voltage transmission system. The output voltage of a transformer can be increased or decreased, with a proportional change in the current ratings. Accordingly, there are two types of transformers: Step up transformer and step down transformer. Construction and working principle of Transformer In a step-up transformer, the input voltage is stepped up to a high output voltage. The number of turns in the primary coil is less than the secondary coil in the step-up transformer. When the output voltage is lower than the input side, it is called a step-down transformer. It has more turns in the primary coil than the secondary coil. Based on the construction and application of a transformer, there are also several other types of transformers. It includes shell type transformer, core type transformer, power transformer, Construction of Transformer The construction of transformer is v...

Principle: The principle of a transformer is the mutual induction between two coils. That is, when an electric current passing through a coil changes with time, an emf is induced in the neighbouring coil. Working: • If the primary coil is connected to a source of alternating voltage, an alternating magnetic flux is set up in the laminated core. • If there is no magnetic flux leakage, then the whole magnetic flux linked with primary coil is also linked with the secondary coif This means that rate at which magnetic flux changes through each turn is same for both primary and secondary coils. • As a result of flux change, emf is induced in both primary and secondary coils. The emf induced in the primary coil ε pis almost equal and opposite to the applied voltage υ pand is given by υ p= ε p= -N p`("d" Φ_"B")/"dt"` .....(1) • The frequency of alternating magnetic flux in the core is the same as the frequency of the applied voltage. Therefore, induced emf in secondary will also have the same frequency as that of applied voltage. • The emf induced in the secondary coil eg is given by ε s= -N s `("d" Φ_"B")/"dt"` where N pand N sare the number of turns in the primary and secondary coil, respectively. If the secondary circuit is open, then ε s= υ swhere υ sis the voltage across secondary coil. υ sε s= -N s `("d" Φ_"B")/"dt"` .....(2) From equation (1) and (2), `"v"_"s"/epsilon_"s" = "N"_"s"/"N"_"p"` = K....(3) This constant K is known as voltage transformation ratio. For an ideal tr...

Hint: A transformer is a device which is used to transfer electrical energy from one circuit to another. Its working is based on the mutual induction of two coils placed in vicinity of each other. Detailed step by step answer: A transformer is an electrical device which is used to couple one circuit to another. The transformer transforms the electrical energy from one circuit to another. A transformer is constructed using two coils wound around a laminated steel core. All the components are electrically insulated from one another The basic working principle of a transformer is mutual inductance between the coils of the transformer. In a transformer, we have a primary coil and a secondary coil. An input signal is fed to the primary coil. The change in flux in secondary coil due to flow of current in primary coil induces an e.m.f in secondary coil. The amount of e.m.f produced in the coils depends on the number of windings of the coils. On the basis of windings, we have two types of transformers: Step-down transformer: The primary coil has more windings than the secondary coil. It decreases or steps down the voltage.

Transformers are electrical devices that are widely used to transfer electrical energy from one circuit to another. The primary function of a transformer is to change the voltage level of an alternating current (AC) power supply to suit the requirements of the load connected to it. They are essential components in the electrical distribution system, allowing the efficient transmission of electrical energy over long distances. Transformers come in various sizes and designs, and their use spans a wide range of applications in various industries. This article explores the fundamentals of transformer devices, their working principle, types, and applications. So let’s get started… Inside Story • • • • • • • • • • • • • • • • • • • • • • • • • What is Transformer class 12? Transformer definition: A transformer is an electrical device that is used to transfer electrical energy from one circuit to another by means of Advertisements What is a transformer? A basic diagram of a transformer A transformer consists of two or more coils of wire wrapped around a common magnetic core. One of the coils, called the primary coil, is connected to the input voltage source, while the other coil, called the secondary coil, is connected to the load. When an AC voltage is applied to the primary coil, it produces a changing magnetic field, which induces an AC voltage in the secondary coil. Advertisements The voltage level in the secondary coil is determined by the ratio of the number of turns in the...

The transformer transforms the energy from one electrical circuit to another. This occurs by using electromagnetic induction. It is known as an efficient voltage converter, and it can reduce the high voltage to low voltage and vice versa. A good-condition transformer consists of two windings, which primary winding and secondary are winding. There are two types of the transformer which are step up and step down 2 Solved Examples Transformer Formula What is a Transformer? The transformer is an electrical device that allows us to increase or decrease the voltage in an alternating current electrical circuit, maintaining power. The power that enters the equipment, in the case of an ideal transformer, is equal to that obtained at the output. Real machines have a small percentage of losses. It is a device that converts the alternating electrical energy of a certain voltage level into alternating energy of another voltage level, based on the phenomenon of electromagnetic induction. It is made up of two coils of conductive material, wound on a closed nucleus of ferromagnetic material, but electrically isolated from each other. The only connection between the coils is the common magnetic flux established in the core. The coils are called primary and secondary according to the input or output of the system in question, respectively. Transformer Formula The value of the power for an electric circuit is the value of the voltage by the value of the current intensity. As in the case of a...