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https://www.samwinsemi.com/products/rectifier-diode/

Rectifier diodes play a crucial role in power supplies by converting alternating current (AC) to direct current (DC), which is essential for the operation of most electronic devices. In an AC power supply, the voltage alternates between positive and negative cycles. Rectifier diodes, with their unidirectional current flow property, allow current to pass only during the positive half-cycles, effectively blocking the negative half-cycles. This process is known as rectification.