Question

Hey! Solve the que no.27 only .-. . Explain the ans in detail ._.​

Answer 1

Answer:

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A transformer is defined as a passive electrical device that transfers electrical energy from one circuit to another through the process of electromagnetic induction. It is most commonly used to increase (‘step up’) or decrease (‘step down’) voltage levels between circuits.

Working Principle of Transformer

• The working principle of a transformer is very simple. Mutual induction between two or more windings (also known as coils) allows for electrical energy to be transferred between circuits. This principle is explained in further detail below.

Principle Of working of a transformer :

A transformer works on the principle that Whenever the magnetic flux linked with a coil changes, an emf is induced in the neighbouring coil.

Construction : It consists of two coils primary (P) and secondary (S), insulated from each other and Wound on a soft iron core as shown in the figure below.

The primary coil is called the input coil and the secondary coil is called the output coil.

Working : When.an alternating voltage is applied to the primary coil, the current through the coil goes, on changing. Hence, the magnetic flux through the core also changes- As this changing magnetic flux is linked with both coils, an emf is induced in each of them. The amount of magnetic flux linked with the coil depends on the number of twins of the coil.

#Be brainly :)

Answer 2

• Transformer : It is an electrical device (essentially AC device) which is used for changing the AC voltages. A transformer which increases the AC voltages is called a step up transformer. A transformer which decreases the AC voltages is called a step down transformer.

• Principle : It is based on the principle of mutual induction (when there is a change in magnetic flux of the primary coil, an e.m.f is induced in the secondary coil).

• Construction : A transformer consists of a rectangular iron core made up of laminated sheets, well insulated from one another. Two coils $\sf P_1$ $\sf P_2$ and $\sf S_1$ $\sf S_2$ are wound on the same core, but are well insulated from each other. Both of the coils are also insulated from the core. The source of alternating e.m.f is connected to the primary coil and a load resistance R is connected to the secondary coil through and open switch. Thus, there can be no current through the secondary coil so long as the switch is open.

• Working : The alternating e.m.f supplied by the AC source connected to primary be

$\sf E_p$ = $\sf E_0$ sin ω t.

In a purely inductive circuit, power factor is cos Φ = cos 90° = 0, therefore no power is dissipated.

$\bold{Hope\;it \; helps\;!}$