What is transformer class 12

More • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Generators and Transformers In this article, let us discuss two important mechanical equipment that are widely used, generators and transformers. A generator converts one form of energy into another. Let us know in detail the working principle of transformer, types and applications of generators and transformers. Table of Contents: • • • • • • • • • • • • • • • • What is the Working Principle of Generator? It consists of a rectangular coil with a number of copper wires wound over an iron core. The coil is called the armature. It is used to increase the magnetic flux. A strong permanent magnet is placed, and the armature is rotated between the magnets where the magnetic lines are perpendicular to the axis of the armature. There are two slip rings connected to the arm...

24 What is the formula for transformer turns ratio? How do you make a transformer for a school project? Wrap two, equal-length bars of steel with a thin layer of electrically-insulating tape. Wrap several hundred turns of magnet wire around these two bars. You may make these windings with an equal or unequal number of turns, depending on whether or not you want the transformer to be able to “step” voltage up or down. What are the types of transformer Class 12? Types of Transformers Step-up Transformer converts a low voltage into a high voltage. The number of turns in the primary coil is less than the number of turns in the secondary coil, i.e. Np < Ns. Step-down Transformer converts a high voltage when current decreases into a low voltage when current increases. What is the conclusion of transformer? Conclusion. A step-up transformer increases voltage. That is, the voltage at the secondary coil is more than the voltage of the primary coil. Although the voltage increases, the current is reduced. What is a transformer formula? This can be written as an equation: V_p × I_p = V_s × I_s. We can also work out the transformer output voltage if we know the input voltage and the number of turns on the primary and secondary coils. What are the 3 types of transformers? Depending on the Power rating and specification, Power transformers can further be classified into three categories: Small power transformer, Medium Power transformers, and the Large power transformers. What are the tw...

Get CBSE class 12th Physics key notes on alternating current. These notes are continuation of CBSE Class 12th Physics Notes: Alternating Current Part – II. In part I, we have studied important concepts like Alternating Current, Alternating Voltage, Average Value of Alternating Current and Voltage, Root Mean Square value of Alternating Current, Phasors, Different Types of A.C. circuits, Charging and Discharging of a Capacitor etc. Whereas, in part II, we have studied AC Voltage Applied to a Series LCR Circuit, Resonance in a Series LCR Circuit, Sharpness of Resonance (Quality Factor), Power Dissipation in AC Circuit, Power Factor, Wattless Current, LC Oscillations. In this part (or part III) we will study the concepts given below: Transformer Types of Transformer Step-Up Transformer Step- Down Transformer Applications of Transformer in Long Distance Power Transmission Efficiency of Transformer ( ƞ) Power Losses in a Transformer Hysteresis Loss Copper Loss Eddy Current Loss The key notes are given below: Transformer A Transformer is used to convert low voltage (or high current) to high voltage (or low current) and vice versa. It is based on the principal of electromagnetic induction. One of the coils called the primary coil has N p turns. The other coil is called the secondary coil; it has N s turns. Often the primary coil is the input coil and the secondary coil is the output coil of the transformer. When an alternating voltage is applied to the primary, the resulting curre...

Transformers are the devices that work on the principle of mutual induction and are responsible for the transformation of altering voltage from higher to lower or lower to higher values.The idea of a transformer was first discussed by Michael Faraday in 1831. The general use of transformers is to maintain a balance between the electricity of high voltage and low voltages. TRANSFORMER- A transformer works on mutual induction and is responsible for transforming alternating voltage from one value to another. There are two types of transformers – The step-up transformer, which decreases the output current, and the step-down transformer, which increases the output current. To put it simply, the transformer performs the function of controlling voltage and hence helps in the easy transmission of alternating current. Michael Faraday primarily pictured the transformer in 1831. PARTS OF TRANSFORMERS Core- this is the support to the transformer and is responsible for or providing a low reluctance path to the flow of magnetic flux. On this core, winding off of wire is done. • The core is composed of soft iron for the sake of reduction of the losses • The diameter of the core is proportional to the losses The primary and the secondary coil- The coils are wrapped around the transformer’s core. These coils are made up of copper to minimise the losses since copper is highly conductive. There are two types of coils- • Primary coil: Denoted by NP (number of turns essentials of the primary c...

Read the following text and answer the following questions on the basis of the same: TOROIDA toroid is a coil of insulated or enamelled wire wound on a donut-shaped form made of powdered iron. A toroid is used as an inductor in electronic circuits, especially at low frequencies where comparatively large inductances are necessary. A toroid has more inductance , for a given number of turns, than a solenoid with a core of the same material and similar size. This makes it possible to construct high-inductance coils of reasonable physical size and mass. Toroidal coils of a given inductance can carry more current than solenoidal coils of similar size, because larger-diameter wires can be used, and the total amount of wire is less, reducing the resistance . In a toroid, all the magnetic flux is contained in the core material. This is because the core has no ends from which flux might leak off. The confinement of the flux prevents external magnetic fields from affecting the behaviour of the toroid, and also prevents the magnetic field in the toroid from affecting other components in a circuit. Standard toroidal transformers typically offer a 95% efficiency, while standard laminated transformers typically offer less than a 90% rating. One of the most important differences between a toroidal transformer and a traditional laminated transformer is the absence of gaps. The leakage flux through the gaps contributes to the stray losses in the form of eddy currents (which is also expelled...

Hint – You can start by defining what a transformer is. Then move on to describe the principle behind the transformer. Then describe the basic setup of a transformer. Then finally write how a transformer works. An electrical device that can change the A.C. current is known as a transformer. Principle – A transformer works on the principle of mutual induction. Mutual induction is the phenomenon by which when the amount of magnetic flux linked with a coil changes, an E.M.F. is induced in the neighboring coil. Construction – A transformer is made up of a rectangular iron core. Two coils, a primary $($. Both these coils are insulated from the Ferro-magnetic iron core. The source of the alternate current is connected to the primary winding and the output is obtained through the secondary winding which is connected in parallel to a resistance $R$. Working - For an ideal transformer, we consider that resistances of the primary and secondary coils are negligible. Let the $E.M.F.$ of the alternate current supplied by the A.C source be $$). Additionally an iron core is used because it is a ferromagnetic material which helps in increasing the strength of the magnetic field.

More • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Step 1: Copper Loss 1. Copper loss occurs in the form of heat energy lost due to the resistance of the copper coils used in the windings of a transformer. 2. Copper loss can be minimized by using wire with a large cross-sectional area in the coils. Step 2: Hysteresis Loss 1. Loss of energy due to continuous magnetization and demagnetization of the transformer is called hysteresis loss. 2. Hysteresis loss in a transformer can be minimized by using soft magnetic materials for the core like permalloy or silicon iron. Step 3: Flux Loss 1. Flux loss occurs if the coupling of the primary and secondary coil is not good. 2. Flux loss in a transfo...