Diodes and Transistors

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13 Terms

1

silicon diode

used in rectification

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2

zener diode

voltage regulator

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3

light emitting diode

used in indicators

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4

forward bias

small resistance to current flow in one direction

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5

reverse bias

resistance extremely high if current goes backwards

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6

transistor switch

a semi-conductor that amplifies a signal from a sensor

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7

base

middle section of transistor, lightly doped to reduce

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8

collector

positive lead of transistor, always reversed biased so that charge carriers move away from the base, moderately doped

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9

emitter

main function is to supply majority of charge carriers to base

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10

doping

process of introducing an atom of another element to the lattice of a pure material

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11

p-doping

process in which the structure is doped with atoms that have 3 electrons in outer shell - creates holes so that current can be conducted as accept electrons from other atoms

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12

n-doping

process in which the structure is doped with atoms that have 5 electrons in outer shell - extra electron allows for conduction as it is free to roam

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13

semiconductor outer shell

4 electrons, performs perfect covalent bonds

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