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Module 3 - Electrical Systems > 3.1-3.3 > Flashcards

3.1-3.3 Flashcards

(61 cards)

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1
Q

What charge does an electron carry?

A

-0.1602 x 10^-18

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2
Q

What charge does a proton carry?

A

+ 0.1602 x 10^-18

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3
Q

What is a charged atom known as?

A

Ion

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4
Q

What is a cation?

A

Positive ion

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5
Q

What is an anion?

A

Negative ion

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6
Q

What is a compound?

A

Two or more different atoms

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7
Q

What is the outer most shell called?

A

Valence shell

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8
Q

What is a conductor?

A

A material that allows the flow of charge.

a metal with a high mobility of electrons

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9
Q

How many electrons does a conductor have in its outer shell?

A

<4

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10
Q

What is a semi conductor?

A

A stable atom that conducts electricity when heat, light or voltage is added.

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11
Q

How many electrons do semiconductors have in their outer shell?

A

4

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12
Q

What is an insulator ?

A

A material that does not conduct electricity

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13
Q

How many electrons does an insulator have in its outer shell?

A

More than 4

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14
Q

Example of good conductors

A

Silver copper carbon and aluminium

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15
Q

Examples of semi conductors

A

Silicon and germanium

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16
Q

Examples of insulators

A

Rubber, mica o porcelain

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17
Q

What are the 4 types of bonding

A

Covalent
Ionic
Metallic
Complex covalent

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18
Q

What is an ion

A

A charge atom

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19
Q

How do semi conductors gain conductivity?

A

Doping

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20
Q

What is the difference between an oscilloscope and an oscillograph?

A

An oscillograph is permanent

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21
Q

How do we create electricity in a liquid ?

A

Electrolysis

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22
Q

Define electrolysis

A

Decomposition of a chemical compound by passing a current through

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23
Q

What is an electrolyte

A

A conducting fluid

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24
Q

What is electrolysis used for

A

Batteries

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25
How do we conduct electricity in solids?
Adding a force so the free electrons flow
26
How do we conduct electricity in gasses
Filament bulb - inert gasses. Gas discharge
27
What kind of electricity is created by friction
Static
28
When a glass rod is rubbed with fur what charge does it have
Negative
29
When a glass rod is rubbed with silk what charge does it have ?
Positive
30
What is induction?
Conduction of electricity without touching
31
What is contact?
Transferring electrons by touching
32
Give an example of when we use induction!
Generators
33
What is Coulomb’s law?
Force is directly proportional to the product but inversely proportional to the distance squared
34
How do we generate electricity in a vacuum
Braun tube (electron gun) Heat cathode Go to anode
35
Why is vacuum better than gas
Safer and faster
36
How is current density calculated
Current / cross sectional area
37
Unit for current density
Amps per m 2
38
What is the difference between conventional flow and electron flow
Electron flow is negative to positive
39
What is conductance and the unit
1/R and the unit is Semens
40
What is MV
Mega Volts
41
What is resistance
Opposition to current flow
42
What is the unit for resistance
Ohms
43
What is ohms law
V = I R
44
How does a chemical cell work?
Placing two metallic electrodes into an electrolyte where a chemical reaction either uses or generates current
45
Why does current make thin helical coils in a light bulb glow white hot?
The resistance high generates heat
46
How hot can we heat a cable
60
47
What is potential difference?
Two differently charged points. Voltage occurs hen there is a deficiency of electrons at one point
48
What is field strength
Density of flux lines
49
What is EMF
Fancy word for voltage
50
What is the relationship between potential energy and the valence layer
The PE is stronger the further the shell
51
The relationship between the electrical attraction and the shells
The further the shell the weaker the electrical attraction
52
What is resistance also known as
Breaking point
53
What is the difference between ac and dc
Ac changed polarity
54
What is the equation for charge
Current x time
55
How do you insert an ammeter
Series
56
How to you insert a voltmeter
Parallel
57
What do you want from a voltmeter
High resistance
58
What do you want from an Ameter
Low resistance
59
1 coulomb is equal to how many electrons
6.24 x 10^18
60
Why is there inert gas in a filament bulb
To protect the filament
61
What happens to the mercury in a filament bulb
Vaporises causing a current path

Module 3 - Electrical Systems (3 decks)

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