What is the role of the input section of a power supply?

The input section of a power supply is primarily responsible for accepting the incoming electrical power, which is usually in the form of an alternating current (AC) signal. This AC source is necessary because most electrical systems and devices are designed to run on AC power, which can be easily transformed and manipulated for various applications.

Once the AC voltage is received, it is prepared for subsequent processing in the power supply, which may include steps such as rectification and filtering. However, the fundamental function of the input section is to incorporate this AC signal into the system before any modifications are made to convert it into a usable direct current (DC) form. Understanding the role of the AC input is crucial, as it sets the stage for the proper function of the entire power supply unit, allowing it to fulfill its purpose of supplying the appropriate voltage and current to electronic devices.