# What is the working principle of transformer Class 12?

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.

## 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 is a transformer class 12 physics?

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 Np turns. The other coil is called the secondary coil; it has Ns turns.

## 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

## How do you design a transformer?

1. Sec.Volt-Amps(SVA) = Vs * Is = 60 * 4.44 =266.4VA.
2. Prim.Volt-Amps(PVA) = SVA / 0.9 = 296.00VA.
3. Prim.Voltage (Vp) = V2 / (n2/n1) = 60/0.5= 120V.
4. Prim.current (Ip) = PVA/Vp = 296.0/ 120 = 2.467A.
5. Core Area(CA) = 1.15 * sqrt(PVA) = 1.15 * sqrt(296) = 19.785 cm²

## What are the two main types of transformers?

• Power Transformers. A power transformer transfers electricity between a generator and the distribution primary circuits.
• Autotransformers. Now, let’s make things even more complicated.
• Generator Step-Up Transformers. Moving right along to GSUs or generator step-up transformers.
• Auxiliary Transformers.

## 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 3 types of transformers PDF?

• Step down transformer.
• Step up transformer.
• Single phase transformer.
• Three phase transformer.
• Power transformer.
• Distribution transformer.
• Current transformer.
• Isolation transformer.

## Which principle is used in transformer?

Transformer works on Faraday’s law of mutual induction. Faraday’s law of electromagnetic induction states that, when a change takes place in the magnetic flux which is linked with a circuit, an electromotive force current will induce in the circuit.

## What is the purpose of transformer?

A transformer is an electrical device that trades voltage for current in a circuit, while not affecting the total electrical power. This means it takes high-voltage electricity with a small current and changes it into low-voltage electricity with a large current, or vice versa.

## What is the role of a transformer?

A transformer is a device that transfers electric energy from one alternating-current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage.

## What are the applications of transformer?

Transformer are used for a wide range of purposes, including increasing the voltage from electric generators to enable long-distance transmission of electricity and decreasing the voltage of conventional power circuits to run low-voltage devices like doorbells and toy electric trains.

## Why kVA rating is used in transformer?

The first reason is the power loss in the transformer. Thus, the total losses in a transformer depend upon volt-ampere (VA) only and not on the power factor of the load. That is why the transformer rating is given in kVA and not in kW.

## What is the name of transformer?

Learn about the Transformers robots. Optimus Prime is the noble leader of the heroic Autobots. He believes freedom is the right of all sentient beings. He carries the Matrix of Leadership, an ancient and powerful artifact that gives him upgraded abilities and knowledge of all Cybertronian history.

## What are the main parts of transformer?

There are three basic parts of a transformer: an iron core which serves as a magnetic conductor, a primary winding or coil of wire and. a secondary winding or coil of wire.

## What is the formula of transformer winding?

Windings and Wire You now need to determine the number of turns that will be required for each secondary winding. The first step is to use formula 3 (N(s) = V(s) / V(p) x N(p)) to determine the turns for a perfect transformer. This number then needs to be increased to account for the losses in the coils.

## What is a power transformer PDF?

A transformer is a device that converts one AC voltage to another AC voltage at the same frequency. It consists of one or more coil(s) of wire wrapped around a common ferromagnetic core. • In practice, the windings are wrapped on top of each other to minimize flux leakage.

## How many turns in a transformer?

A single phase transformer has 480 turns on the primary winding and 90 turns on the secondary winding. The maximum value of the magnetic flux density is 1.1T when 2200 volts, 50Hz is applied to the transformer primary winding.

## What is the SI unit of transformer?

Transformer’s operation The total number of field lines is called a magnetic flux (Φ). The SI unit name for magnetic flux is weber and its symbol is Wb (1 Wb = 1 Vs).

## Which transformer is used in home?

Step-Down Transformer The winding turns more on the primary side than the secondary side. In distribution networks, the step-down transformer is commonly used to convert the high grid voltage to low voltage that can be used for home appliances.

## What are the losses in transformer?

The four main types of loss are resistive loss, eddy currents, hysteresis, and flux loss.

## Which oil is used in transformer?

Mineral oil and Synthetic oil are the majorly used transformer oil. These are the petroleum products, like Naphthenic based transformer oil and Paraffinic based transformer oil. Naphthenic based transformer oils are known for their heat distribution, which is one of the main problems with transformer.

## What is transformer explain with diagram?

Solution : A transformer is a device used for varying AC voltages. It works on the principle of mutual induction. Working : As the current through the primary varies, the magnetic flux linked with the secondary also varies. As a result, alternating emf of the same frequency is induced across the secondary.

## What is working principle of transformer PDF?

The basic principle behind working of a transformer is the phenomenon of mutual induction between two windings linked by common magnetic flux. The figure at right shows the simplest form of a transformer. Basically a transformer consists of two inductive coils; primary winding and secondary winding.

## What is voltage transformer ratio?

The primary and the secondary terminal voltages of a transformer are proportional to the respective number of turns. The ratio of the primary to secondary terminal voltage is known as voltage ratio.