The conventional current flows from the positive (anode) terminal to the negative (cathode) terminal although the movement of electrons (electron flow) is in the opposite direction, from cathode to anode.
The above general rule notwithstanding, if the cathode voltage is positive relative to the anode voltage by a great enough amount, the diode will conduct current. The voltage required to produce this phenomenon, known as the avalanche voltage, varies greatly depending on the nature of the semiconductor material from which the device is fabricated. The avalanche voltage can range from a few volts up to several hundred volts.
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