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APPLIEDMETERS electrical components are electronic devices made from semiconductor materials (silicon, selenium, germanium, etc.). A diode has two electrodes: the positive electrode, also called the anode; and the negative electrode, also called the cathode. When a forward voltage is applied across the two poles of the diode, the diode conducts; when a reverse voltage is applied, the diode cuts off. The conduction and cutoff of the diode are equivalent to the closing and opening of a switch. The diode has unidirectional conductivity; when conducting, the current flows from the anode through the tube to the cathode. The diode is one of the earliest semiconductor devices, and its application is non