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The minimum positive voltage required to make current flow through it.
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These slides explain why a minimum potential difference is necessary:
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The threshold voltage of a diode is the minimum voltage required for the diode to conduct in the forwards direction.
Threshold voltage of diode means when a diode has enough energy in it so that electric current passes through it easily
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The minimum voltage needed for current to flow through the diode (for the diode to be switched on)
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