Physics of a diode (continued)
The graph on the right shows represents relationship of current over voltage in a zener diode. This graph is similar to the basic junction diode except the junction diode does not have the current drop shown on the left side of the graph (it remains zero).
In most diodes the holes in the depletion layer won't open until a specific amount of voltage has been surpassed. Since silicon is the material most diodes are made of, the voltage in most diodes at which the holes can be opened and current be produced is approximately 0.7V.
Zener diodes are able to produce a current when the certain voltage is surpassed in the reverse-bias configuration. Zener diodes made of silicon usually create current at around 6V in when it is reverse-biased.
|Application of a diode in a circuit:|
|Consider each circuit schematic
below (suppose the junction diode in these circuits is a silicon diode)
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