polovodiče Flashcards

1
Q

nakresli graf závislosti odporu na teplote u kovu a polovodice - el. odpor

A

musi byt videt, ze u kovu R mirne stoupa

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2
Q

termistor - znacka, jak funguje, uziti

A

funguje na bazi vlastni vodivosti - R s t prudce klesá
užití: mereni a regulace t - digitalni teplomery, stabilizace obvodu

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3
Q

fotorezistor - znacka, jak funguje, uziti

A

R klesá s osvetlenim
mereni a regulace osvetleni
fotob.

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4
Q

polovodice typu N
jake atomy tvori primesy?
2 priklady

A

atomy s 5 valencnimi el.
pr. kremik dopovany fosforem/arsenem

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5
Q

polovodice typu P
jake atomy tvori primesy?
2 priklady

A

atomy se 3 valencimi el.
kremik dopovany borem/galliem
majoritni nosice naboje - diry
minoritni - el.

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6
Q

dioda zapojena v propustnwm smeru - co se deje s hradlovou vrstvou a co to je, nakreslit

A

hradlová vrstva zaniká
hradlova vrstva = oblast v okoli PN prechodu
uziti - usmernovace

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7
Q

dioda zapojena v zavernem smeru - co se deje s hradlovou vrstvou a co to je, nakreslit

A

hradlova vrstva se zvetsuje
Hradlová vrstva je oblast v okoli PN prechodu

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8
Q

jednocestny usmernovac - nakreslit vstupmi a vystupni proud

A

vystupni - tepavy

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9
Q

dvoucestny usmernovac - vyuziti, kolik diod, nakreslit vstupmi a vystupni proud

A

4 diody
vystupni - pulzujici stejnosmerny
v nabijeckach

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10
Q

usmernovaci dioda a voltamperova charakteristika - graf, co se stane po prekroceni a) prahoveho napeti b) pri prekroceni prurazneho napeti

A

a) zacne prochazet I
b) se dioda znici

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11
Q

LED - nazev, co se deje po prekroceni prahoveho napeti, 4 pr uziti

A

luminiscencni (svetloemitujici) dioda
po prekroceni prahoveho napeti sviti
1. monitory, displeje, obrazovky
2. kontrolky
3. svitidla
4.mereni vzdalenosti

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12
Q

fotodioda

A

po osviceni ji prochazi proud i v zavernem smeru, velikost proudu roste s osvetlenim
fotob., mereni a regulace osvetleni

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13
Q

tranzistor casti + nakresli schematicke znacky prechodu pnp

A

C - kolektor
B - baze
E - emitor

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14
Q

nakresli prevodni charakteristiku tranzistoru

A

.

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