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A1 Lt A-6 > Chararicteristics Of Semiconductors > Flashcards

Chararicteristics Of Semiconductors Flashcards

1
Q

What makes a material classified as a conductor, insulator or a semiconductor

A

The number or valence electrons
Conductors = 1-3
Insulator = 5 or more
Semiconductor = 4

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2
Q

What are Two semiconductor elements

A

Germanium and silicon

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3
Q

Valence electrons adjoining atoms in a crystal-lattice structure is called

A

Covalent bonding

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4
Q

What is doping

A

Adding or taking away elections

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5
Q

Semiconductor have a __________ temperature coefficient of resistance

A

Negative

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6
Q

What mounting device is used for semiconductors to dissipate heat

A

Heat sink

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7
Q

Why is silicon more common used then germanium for semiconductor devices

A

Silicon can withstand higher temperature

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8
Q

The anode of a diode is made of what types of semiconductors

A

P,N

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9
Q

Reverse bias is when an annoyed is negative or positive

A

Negative

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10
Q

The forward voltage drop across a silicon diode measures at what number

A

0.7 V

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11
Q

In the symbol for a diode the arrow represents what —|<|

A

The anode

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12
Q

When a diode is forward based electrons flow from ?

A

Cathode to anode

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13
Q

What’s the difference between a zener diode and a conventional rectifier diode

A

Zener diodes operate with reverse bias as the voltage regulator.

Conventional diode is intended to operate only with forward bias

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14
Q

What is zener voltage

A

Its the voltage across the Zener when it operates

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15
Q

When using a Zener diode as a D.C voltage regulator, what three condition must be satisfied

A

1, Connected in reverse bias 2, have a voltage rating lower then the source voltage 3, have a stabilizing resistor connected in series to limit the current

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16
Q

PIV rating in a light-emitting diode is __________
V maximum

A

6v

17
Q

What does an LED need to be when it operates

A

Forward bias

18
Q

When using illuminance characteristics of photodiodes in circuit operations how does a diode need to be connected

A

Reverse bias

19
Q

Since the reverse currents of photodiodes are so small, what must be amplified

A

Transistors

20
Q

What colour LED has the highest voltage drop when conducting

A

Green

21
Q

What does PIV mean

A

Peak inverse voltage

22
Q

What dose NPN mean

A

Not pointing in

23
Q

What does PNP mean

A

Pointing in permanently

24
Q

What does E-B-C mean

A

Emitter-bass-collecter

25
Q

Three significant ratings associated with rectifier diodes

A

Forward current
Forward voltage
Low PIV

26
Q

What is the name given to a diode used for ARC suppression

A

Free wheeling

27
Q

Two typical ratings associated with Zener diodes

A

1, Zener watts
2, Zener volts

28
Q

What happens when a depletion region is connected in reverse bias

A

It gets bigger in size and higher in resistance

29
Q

What happens when a depletion region is connected in forward bias.

A

It gets smaller in size so lower resistance

30
Q

What are two basic porpoises of transistors

A

1, To turn on and off
2, to amplify

31
Q

What does BJT mean

A

Bipolar junction transistor

32
Q

What does a BJT doo

A

Uses holes and electrons as current carriers

33
Q

What does a transistor do

A

Turns a little bit of power into a lot of

34
Q

Saturation

A

When the transistor is fully on

35
Q

Transistor Cut off is what ?

A

When the base current is reduce to zero or the base current is open

36
Q

What are semi conductors properties

A

They form a lattice structure

37
Q

What is it called when a transistor is fully on

A

Saturated

38
Q

Zener diodes have to be what way when conducting

A

Ravers bias

A1 Lt A-6 (2 decks)

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