Overall Review

Question 1

Invented the first practical electron tube called the ‘fleming valve’

Answer 1

John Ambrose Fleming

Question 2

AKA Electron tube
It is a sealed glass or metal-ceramic enclosure used in electron circuitry to control the flow of electrons between the metal electrodes sealed inside the tubes

Answer 2

Vacuum Tubes

Question 3

Came into its own invention of the transistor in 1947

Answer 3

Solid state device

Question 4

The opposite of vacuum technology, which depended on the continuous and free flow of electrons

Answer 4

Solid state

Question 5

Classes of solid-state materials:

Answer 5

1. Insulator
2. Semiconductors
3. Conductors

Question 6

Materials that permit electrons to flow freely

Answer 6

Conductors

Question 7

Materials that impede the flow of electrons

Answer 7

Insulators

Question 8

Materials that are neither a good conductor or a good insulator; when the temperature is low, it acts as an insulator

Answer 8

Semiconductors

Question 9

An electric circuit component from a material that is neither a good conductor or a good insulator

Answer 9

Semi-conductor devices

Question 10

Major semi-conductor material

Answer 10

Germanium

Question 11

Modern day semiconductor devices

Answer 11

1. transistors
2. resistors
3. ICs
4. operational amplifier / 143
5. diodes

Question 12

Types of semiconductors

Answer 12

1. P-type (carries the current as the charged holes move)

2. N-type (carries are negative)

Question 13

Resists the flow of the current

Answer 13

Resistors

Question 14

Provides the first digit of the code

Answer 14

1st band

Question 15

Provides the second digit of the code

Answer 15

2nd band

Question 16

Provides the multiplier of the code

Answer 16

3rd band

Question 17

Indicates the tolerance value

Answer 17

4th band

Question 18

Stores an electric charge between two plates

Answer 18

Capacitors

Question 19

Unit of the capacitors

Answer 19

Farads

Question 20

The materials between the plates of the capacitor

Answer 20

Dielectric material

Question 21

REMINDERS

Answer 21

• Electrons on the left plate are attracted towards the positive terminal of the voltage source
• Electrons are pushed towards the right plate
• Excess electrons leaves a negative charge

Question 22

Device that lets current pass only in one direction

Answer 22

Diode

Question 23

Two leads of the diode

Answer 23

ANODE (POSITIVE) and CATHODE (NEGATIVE)

Question 24

The interface b/w p and n type

Answer 24

Pn-junction (Junction)

Question 25

A barrier b/w the p and n type silicon that contains no free electrons of holes

Answer 25

Depletion zone

Question 26

The condition that permits current through the pn-junction of the diode

Answer 26

Forward bias

Question 27

The condition where the depletion zone widens until its potential difference equals the bias voltage, majority-carrier current ceases

Answer 27

Reverse bias

Question 28

Process of adding extra electrons

Answer 28

Doping (BTS nyehehehhe)

Question 29

Process of adding holes

Answer 29

Doped with “holes”

Question 30

Designed to pass electrons from the emitter to the collector

Answer 30

NPN BJT Transistor

Question 31

Designed to pass electrons from the emitter to the collector that flows in the opposite direction; the emitter emits “holes” which are collected by the collector

Answer 31

PNP BJT Transistor