A transformer is a device that transmits power from the primary circuit to **the secondary circuit**. The primary circuit of a transformer gets electricity at a certain voltage from an alternating current power supply. As shown in the image, the transformer sends this power at a different voltage to **an electrical device** linked to the secondary circuit. This process can be repeated as many times as desired by linking more than one secondary circuit to the same transformer.

The basic principle behind how power transfers in a transformer works is based on the action of magnetic fields. When electric current flows through a conductor, it creates a magnetic field around the conductor. If another conductor with a current flowing through it is placed near the first conductor, then these two currents will not flow simultaneously into each other, but instead they will separate themselves into different conductors. This means that there will be a portion of the first conductor's current that won't meet the second conductor's current and therefore won't flow into it. Instead, this uncoupled portion of current will go back to where it came from, i.e., the first conductor.

This explanation is only valid if both conductors are inside a single material. If we take a look at the example below, we can see that the current in the primary coil (the blue part) goes into the iron core (the black part), which causes the magnetic field around the core to become stronger. This in turn causes the current in the secondary coil (the red part) to increase too.

A transformer is a piece of electrical equipment used to convert alternating electricity from one voltage to another. When a voltage is applied to one coil, known as the primary, it magnetizes the iron core. The other coil, known as the secondary or output coil, is subsequently induced with a voltage. The secondary coil will have more energy than the original input because it has two times the number of windings as the primary coil.

The amount of power delivered to the secondary circuit is determined by the ratio of the numbers of turns between the primary and secondary coils. If the turns on the secondary are twice that of the primary, then the factor of reduction is 2. If the secondary has four times the number of turns as the primary, then the factor of reduction is 4.

In general, for every turn added to the secondary coil, the factor of reduction is equal to the number of turns in the primary coil. For example, if you add 10 more turns to your secondary coil, then the factor of reduction is also 10. This means that the power output is increased by a factor of 10. Since we started with 20 watts, this adds 200 watts to the output. The total power out put now is 210 watts.

A transformer is a device that converts electric energy from one alternating-current circuit to **one or more other circuits** by increasing (stepping up) or decreasing (stepping down) the voltage. Transformers have multiple primary and secondary coils which can be connected in **different ways** to produce various combinations of voltages and currents on each side of the transformer.

They are used in power supplies to change the voltage being supplied to an appliance such as **a computer monitor** or television. In addition, transformers are also used in electrical machinery, especially motors, for reducing voltage from a high source to drive other machinery or lamps. Finally, transformers are also used in radio frequency (RF) equipment to increase or decrease voltage for specific purposes. They are also called voltage regulators because they regulate **the output voltage** of the system relative to the input voltage.

Transformer design involves choosing the number of turns in the primary and secondary windings, as well as the geometry of these loops. The amount of magnetic flux produced by a given size coil depends on the number of turns in the loop and their spacing. Therefore, the choice of these parameters determines the performance of the transformer.

Also, the material used in transformer construction affects its performance.