1. Ensure the safety of users' electricity consumption, and ensure that the voltage can meet the electricity needs of different electrical appliances. For example, in electric welding, the current required between the electrode and the weldment is large, and the voltage is small. An electric welding machine is a transformer that turns high voltage into low voltage. Without changing the power, a large current is generated at the output.
2. Play the role of buck-up, so that the high voltage is reduced, or the low voltage is raised. For example, in long-distance input electrical lines, in order to reduce line losses, the power from the power plant should first be boosted to tens of thousands of volts (such as 11KV), and then step-down (such as 220V) when it reaches the destination.
3. Play a safe isolation role, so that when the primary or secondary side of the transformer is abnormal, it will not affect the normal power consumption of the other side.
4. Play the role of impedance transformation. For example, in the electronic amplification circuit, in order to achieve the minimum energy consumption between the two lines of amplification, impedance matching should be carried out, and the transformer connection can play a role in changing the impedance.
5. Play the role of current change. Current transformers are a type of transformer that converts large currents on the primary side into small currents.
