[size=18pt][center]DIODE[/center][/size]

[size=16pt]A diode is an electrical device allowing current to move through

it in one direction with far greater ease than in the other. The

most common kind of diode in modern circuit design is the

semiconductor diode, although other diode technologies exist.

Semiconductor diodes are symbolized in schematic diagrams

such as Figure below. The term “diode” is customarily reserved

for small signal devices, I ≤ 1 A. The term rectifier is used for power devices, I > 1 A.

Semiconductor diode schematic symbol: Arrows indicate the direction of electron
current flow.
When placed in a simple battery-lamp circuit, the diode will either allow or

prevent current through the lamp, depending on the polarity of the applied

voltage. (Figure below)

Diode operation:

(a) Current flow is permitted; the diode is forward biased.

(b) Current flow is prohibited; the diode is reversed biased.

When the polarity of the battery is such that electrons are

allowed to flow through the diode, the diode is said to be

forward-biased. Conversely, when the battery is “backward”

and the diode blocks current, the diode is said to be reverse-biased.

A diode may be thought of as like a switch: “closed” when forward-biased

and “open” when reverse-biased. [/size]


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