A rectifier is a crucial component in circuit boards used to make currents flow. A rectifier’s purpose is to convert the alternating current (AC) to direct current (DC), then pass it to the core circuit of a device or system. Rectifiers can generate a DC supply either by rectifying the positive or negative cycle or by rectifying both of them. Rectifier cathode references the direction in which the current flows, which is dependent on how users put them into the circuit.