A6 LT6 Flashcards

1
Q

How is the emitter identified in a transistor symbol?

A

Arrow from P-type to N-type

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2
Q

What are the advantages of a transistor compared to a relay circuit?

A

Solid-state, no moving parts.

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3
Q

What occurs when a small emitter-to-base current is established in a transistor?

A

A much larger emitter-to-collector current can occur.

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4
Q

What is the difference between the emitter and collector regions of a BJT?

A

N-type

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5
Q

To operate an NPN transistor, what is the requirement for the emitter?

A

It must be negative

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6
Q

What happens when a transistor is saturated?

A

It is fully open

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7
Q

What does a transistor do

A

1, turns on a off
Amplifys

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8
Q

What happens if the P-type layer is removed?

A

Load current flows through N-type regions

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9
Q

How is the base-emitter junction biased in all transistor circuits?

A

Forward-biased

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10
Q

What happens when the base current is increased in a transistor circuit?

A

Decreases internal collector-to-emitter resistance

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11
Q

To operate an NPN transistor, what is the requirement for the base?

A

It must be positive

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12
Q

How is an NPN transistor constructed?

A

N-type/P-type/N-type

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13
Q

What does the base layer of P-type semiconductor do?

A

Blocks conduction through load circuit

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14
Q

How is the collector biased in all transistor circuits?

A

Reverse-biased

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15
Q

To operate an NPN transistor, what is the requirement for the collector?

A

It must be positive

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16
Q

What does the transistor act like when it is cut off?

A

an open switch

17
Q

How is a PNP transistor constructed?

A

P-type/N-type/P-type

18
Q

Where do electrons move once they enter the base in a control circuit?

A

Towards the collector

19
Q

To operate a PNP transistor, what is the requirement for the emitter?

A

It must be positive

20
Q

What can transistors be compared to for simple applications like ohmmeter testing?

A

Back-to-back diodes

21
Q

What does a transistor do in electronics?

A

Regulates current

22
Q

Which way does the emitter arrow point in an NPN transistor?

A

From P- to N-type semiconductor

23
Q

To operate a PNP transistor, what is the requirement for the base?

A

It must be negative

24
Q

What is the actual source of current for a transistor?

A

DC power supply like a battery

25
Q

What allows a much larger current to pass through to the collector region and the load circuit?

A

Decreasing base resistance

26
Q

What materials are most transistors made of?

A

Silicon semiconductor

27
Q

What happens when the control circuit is open in a transistor circuit?

A

No current flows.

28
Q

What are the are the 3 places on a transistor

A

Collector, Base, Emitter

29
Q

What does the beta of a transistor express?

A

Magnitude of collector current controlled by a specific value of base current

30
Q

How can you calculate the value of base current if collector current and beta are known?

A

By dividing collector current by beta.