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When the applied reverse voltage exceeds a certain value, the reverse current will suddenly increase, which is called electrical breakdown.

When the applied reverse voltage does not exceed a certain range, the current through the diode is the reverse current formed by the drift movement of minority carriers.

When the forward voltage is applied, in the initial part of the forward characteristic, the forward voltage is small enough to overcome the blocking effect of the electric field in the PN junction,...

The diode has unidirectional conductivity, and the volt-ampere characteristic curve of the diode is .

The main principle of the diode is to use the unidirectional conductivity of the PN junction, adding leads and packaging to the PN junction to become a diode.

The diode is encapsulated by a PN junction plus the corresponding electrode lead and tube shell.

A diode is an electronic device made of semiconductor materials (silicon, selenium, germanium, etc.) .

Select the R*100 (or R*1K) gear of the ohm range, first connect one pin with the red test lead, and connect the black test lead to the other pin, two resistance values can be measured

According to the semiconductor materials used in transistors, it can be divided into silicon material transistors and germanium material transistors.

A transistor, whose real name is a semiconductor triode, is a semiconductor device with two PN junctions inside and three lead-out electrodes outside.

A tube, no matter how good, will gradually deteriorate due to changes in cathode atoms and chronic leakage.

A transistor is a semiconductor device commonly used in amplifiers or electronically controlled switches.