Flashcards in ITEC 320 Test #2 Deck (107)
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1
Transistor
A solid-state device made of semiconductor material such as silicon or germanium.
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Types of transistors
NPN and PNP
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Three elements of a transistor
Base, emitter, and collector
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Base
Inner element of a transistor. The base controls transistor action.
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What material is the base made out of in a NPN transistor
P material
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What material is the base made out of in a PNP transistor
N material
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Emitter
On of the outer elements of the transistor
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What material is the emitter made out of in a NPN transistor
N material
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What material is the emitter made out of in a PNP transistor
P material
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Collector
One of the other outer elements of a transistor
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What material is the collector made out of in a NPN transistor
N material
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What material is the collector made out of in a PNP transistor
P material
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NPN transistor
A bipolar transistor in which outer elements (emitter and collector) are made of N-type of semiconductor material and the inner element (base) is made out of P-type material
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PNP transistor
A bipolar transistor in which the outer elements (emitter and collector) are made out of P-type semiconductor material and the inner element (base) is made out of N-type material
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P-type material
Semiconductor material that is doped with very small amounts of acceptor impurity materials that decrease active electrons.
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What are the majority charge carriers in P-type materials
Holes
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N-type material
Semiconductor material that is doped with very small amounts of donor impurity materials that add active electrons.
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What are the majority charge carriers in N-type materials
Electrons
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What are 2 basic transistor types
NPN and PNP
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How many elements does a transistor have
3 (base , emitter, and collector)
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In the transistor schematic symbol, the arrow is on what element
Emitter
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What is the most common problem with transistors
Overheating
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What can you use in place of a transistor tester to check transistors
Ohmmeter
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When reverse biased, a diode will block, pass current
Block
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When forward biased, a diode will block, pass current
Pass
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When testing transistors, consider them to be
Back-to-back diodes
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A diode that is forward biased will have high, low resistance
Low
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A diode that is reverse biased will have high, infinity resistance
Infinity
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To test transistors to determine if they are NPN or PNP, what must you know about the ohmmeter
The negative and positive leads
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