Transformers are electrical devices that transfer electrical energy from one circuit to another through inductively coupled conductors—the transformer's coils. Electrical energy is transferred between the coils through the magnetic field.

The transformer's coils are wound around a core of ferromagnetic material, such as iron, which concentrates the magnetic field. When an alternating current (AC) flows through the primary coil, it creates a magnetic field in the core. This magnetic field then induces an AC current in the secondary coil.

The voltage of the secondary coil is proportional to the number of turns in the coil, while the current is inversely proportional to the number of turns. This means that a transformer can be used to step up or step down the voltage of an AC electrical signal.

Transformers are used in a wide variety of applications, including power distribution, audio amplification, and electrical isolation.

Here is a simplified explanation of how a transformer works:

1. An alternating current (AC) flows through the primary coil, creating a magnetic field in the core.

2. The magnetic field then induces an AC current in the secondary coil.

3. The voltage of the secondary coil is proportional to the number of turns in the coil, while the current is inversely proportional to the number of turns.

4. This means that a transformer can be used to step up or step down the voltage of an AC electrical signal.

Transformers are essential components of many electrical devices, and they play a vital role in the distribution of electrical power.