DIODE
The diode is a electronic version of the non-return valve. It allows electron flow in one direction but not the other. When the voltage is applied across the diode so that electron flow is allowed this is referred to as Forward-Bias, when the voltage is applied so that electron flow is blocked this is referred to as Reverse Bias.
A diode consists of P-type (material with slight electron deficit sometimes imagined as having positive holes) and N-type (material with slight electron excess). This may be manufactured by the use of doping agents in semiconductor material such as Germanium or Silicon. The juncture of the two materials is called the depletion zone as it contains niether excess electrons or postivie holes into which the electrons can enter.
When a forward bias voltage is applied there is a tendency for the electrons and positive holes to be drawn into the depletion layer collapsing it until current can flow freely. When a reverse bias is applied the electrons and positive holes are drawn away from the depletion layer expanding it and preventing current flow
The diode is a electronic version of the non-return valve. It allows electron flow in one direction but not the other. When the voltage is applied across the diode so that electron flow is allowed this is referred to as Forward-Bias, when the voltage is applied so that electron flow is blocked this is referred to as Reverse Bias.
A diode consists of P-type (material with slight electron deficit sometimes imagined as having positive holes) and N-type (material with slight electron excess). This may be manufactured by the use of doping agents in semiconductor material such as Germanium or Silicon. The juncture of the two materials is called the depletion zone as it contains niether excess electrons or postivie holes into which the electrons can enter.
When a forward bias voltage is applied there is a tendency for the electrons and positive holes to be drawn into the depletion layer collapsing it until current can flow freely. When a reverse bias is applied the electrons and positive holes are drawn away from the depletion layer expanding it and preventing current flow
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