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Chemistry RT > QT in TLE > Flashcards

QT in TLE Flashcards

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1
Q

He invented the first practical electron tube called “Fleming Valve”.

A

John Ambrose Fleming

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2
Q

It is also called the electron tube.

A

Vacuum Tubes

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3
Q

A sealed-glass or metal-ceramic enclosure used in electronic circuitry to control the flow of electrons between metal electrodes sealed inside the tubes.

A

Vacuum Tubes

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4
Q

Within a vacuum bulb, a ? is heated (directly or indirectly).

A

Cathode

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5
Q

What do you call the metal cylinder surrounding the cathode?

A

Plate

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6
Q

Came on its own with the invention of the transistor in 1947.

A

Solid state device

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7
Q

The opposite of vacuum technology. It also used in contrast to any device with a moving part, such as hard disk drive.

A

Solid state

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8
Q

Name the solid state materials.

A

Conductors, insulators and semi-conductors.

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9
Q

Materials that permit electrons to flow freely from particle to particle.

A

Conductors

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10
Q

Materials that impede the free flow of electrons from atom to atom and molecule to molecule.

A

Insulators

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11
Q

Neither a good conductor nor a good insulator.

A

Semiconductors

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12
Q

During the early 1950s, what was the major semiconductor material?

A

Germanium

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13
Q

During the early 1960s, what has become the practical substitute for semiconductor material?

A

Silicon

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14
Q

At high temperature its conductivity approaches that of a what?

A

Metal

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15
Q

Same question from before but at low temperature?

A

Insulator

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16
Q

Examples of modern-day semiconductor materials.

A

Transistors, resistors, ICs, operational amplifiers, diodes.

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17
Q

The 2 types of semiconductor:

A

N-type and P-type

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18
Q

Carries negative electrons.

A

N-type

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19
Q

Positive charged holes move and carry the current.

A

P-type

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20
Q

They come in variety of shapes, sizes and forms. They have value of resistance printed on them or as a color code.

A

Resistors

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21
Q

What the does the 1st band indicates in a resistor?

A

First digit of the code

22
Q

The 2nd?

A

Second digit of the code

23
Q

The 3rd?

A

Multiplier

24
Q

The 4th??

A

Tolerance Value

25
Q

Arrange the color of the bands.

A

Black, brown, red, orange, green, blue, violet, gray, white, gold, silver.

26
Q

What is the function of a capacitor?

A

It stores electrical charge between two plates.

27
Q

Unit of capacitance.

A

Farads

28
Q

What is the material between the plates of a capacitor?

A

Dielectric material

29
Q

A device that passes current in only one direction.

A

Diodes

30
Q

The 2 leads of a diode, indicate their sign.

A

Anode (+) and Cathode (-)

31
Q

What do you call the interface between p-type and n-type material?

A

PN-Junction

32
Q

The intersection between p and n side.

A

Junction

33
Q

A barrier between the n-type and p-type silicon that contains no free electrons or holes.

A

Depletion zone

34
Q

DC Voltage positive terminal connected to the p region and negative to the n region. It is the condition that permits current through the pn-junction of a diode.

A

Forward bias

35
Q

Negative terminal connected to the p-region and positive to the n-region.

A

Reverse bias

36
Q

Fundamentally three-terminal devices.

A

Transistors

37
Q

Arrange in order of the pins in NPN transistor:

A

C-B-E

38
Q

In PNP transistor:

A

E-B-C

39
Q

When layers have extra electrons added to them, the process is called?

A

Doping

40
Q

True or false? Electrons can easily flow from the p-type to n-type collector as long as the base-emitter junction is reversed biased.

A

False (forward biased)

41
Q

The ? is designed to pass electrons from the emitter to the collector.

A

NPN BJT transistor

42
Q

Instead of electrons, the emitter emits “holes” which are collected by the collector.

A

PNP BJT transistor

43
Q

WRITE A IF IT DESCRIBES A SOLID STATE DEVICE AND B IF NOT.

It is invented since 1950s.

A

B

44
Q

Insulator is an example of it.

A

A

45
Q

The device is within a vacuum bulb.

A

B

46
Q

Made up of cathode and anode.

A

B

47
Q

Opposite of vacuum technology.

A

A

48
Q

Used to build devices with a vacuum

A

B

49
Q

Needs 2 external sources to function

A

B

50
Q

Contrast to any device with any moving part.

A

A

51
Q

Depended on the continuous flow of electron charges

A

A

52
Q

Commonly grouped in two classes: n-type and p-type.

A

B

Chemistry RT (2 decks)

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