Standard rectifier diodes are semiconductor devices that allow current to flow in one direction while blocking it in the opposite direction. They are commonly used in power supply circuits to convert alternating current (AC) into direct current (DC). This process is essential for powering electronic devices that require a stable voltage. These diodes are typically made from silicon and have a forward voltage drop of about 0.7 volts. Standard rectifier diodes are rated for specific current and voltage levels, making them suitable for various applications, including power adapters, battery chargers, and signal demodulation.