What is transformers 12 physics?

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 is the concept of 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 transformers in physics?

Transformers are used to increase or decrease the voltage of alternating currents. A transformer consists of two coils of wire wound on a metal core. An alternating voltage is applied to one coil (the primary coil). This causes a changing (alternating) magnetic field to be set up in the core.

What is the principle of transformer Class 12?

mutual induction
The transformer works on the principle of Faraday’s law of electromagnetic induction and mutual induction. There are usually two coils primary coil and secondary coil on the transformer core. The core laminations are joined in the form of strips. The two coils have high mutual inductance.

What is transformers and its types?

The different types of transformer are Step up and Step down Transformer, Power Transformer, Distribution Transformer, Instrument transformer comprising current and Potential Transformer, Single phase and Three phase transformer, Auto transformer, etc. Contents: Step up and Stepdown Transformer.

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). Magnetic flux density (B) means the total number of field lines per unit of cross-sectional area (A).

What is a transformer?

In a transformer, the electrical energy transfer from one circuit to another circuit takes place without the use of moving parts. A transformer which increases the voltages is called a step- up transformer.

What is the output voltage of the transformer across the secondary?

CONCLUSION 1. The output voltage of the transformer across the secondary coil depends upon the ratio (Ns/Np) with respect to the input voltage 2. The output voltage of the transformer across the secondary coil depends upon the ratio (Ns/N p) with respect to the input voltage 3.

What is the efficiency of an ideal transformer?

EFFICIENCY Efficiency of a transformer is defined as the ratio of output power to the input power. i.e. η = output power / input power = Es Is / Ep Ip Thus in an ideal transformer, where there is no power losses , η = 1. But in actual practice, there are many power losses; therefore the efficiency of transformer is less than one. 14.

How much does a transformer weigh?

As such transformers are built in an amazing strength of sizes. In electronic, measurement and control circuits, transformer size may be so small that it weight only a few tens of grams where as in high voltage power circuits, it may weight hundred of tones.