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Module 3 - Electrical Systems > 3.1-3.3 > Flashcards

3.1-3.3 Flashcards

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
Q

How do we conduct electricity in solids?

A

Adding a force so the free electrons flow

26
Q

How do we conduct electricity in gasses

A

Filament bulb - inert gasses. Gas discharge

27
Q

What kind of electricity is created by friction

A

Static

28
Q

When a glass rod is rubbed with fur what charge does it have

A

Negative

29
Q

When a glass rod is rubbed with silk what charge does it have ?

A

Positive

30
Q

What is induction?

A

Conduction of electricity without touching

31
Q

What is contact?

A

Transferring electrons by touching

32
Q

Give an example of when we use induction!

A

Generators

33
Q

What is Coulomb’s law?

A

Force is directly proportional to the product but inversely proportional to the distance squared

34
Q

How do we generate electricity in a vacuum

A

Braun tube (electron gun)
Heat cathode
Go to anode

35
Q

Why is vacuum better than gas

A

Safer and faster

36
Q

How is current density calculated

A

Current / cross sectional area

37
Q

Unit for current density

A

Amps per m 2

38
Q

What is the difference between conventional flow and electron flow

A

Electron flow is negative to positive

39
Q

What is conductance and the unit

A

1/R and the unit is Semens

40
Q

What is MV

A

Mega Volts

41
Q

What is resistance

A

Opposition to current flow

42
Q

What is the unit for resistance

A

Ohms

43
Q

What is ohms law

A

V = I R

44
Q

How does a chemical cell work?

A

Placing two metallic electrodes into an electrolyte where a chemical reaction either uses or generates current

45
Q

Why does current make thin helical coils in a light bulb glow white hot?

A

The resistance high generates heat

46
Q

How hot can we heat a cable

A

60

47
Q

What is potential difference?

A

Two differently charged points. Voltage occurs hen there is a deficiency of electrons at one point

48
Q

What is field strength

A

Density of flux lines

49
Q

What is EMF

A

Fancy word for voltage

50
Q

What is the relationship between potential energy and the valence layer

A

The PE is stronger the further the shell

51
Q

The relationship between the electrical attraction and the shells

A

The further the shell the weaker the electrical attraction

52
Q

What is resistance also known as

A

Breaking point

53
Q

What is the difference between ac and dc

A

Ac changed polarity

54
Q

What is the equation for charge

A

Current x time

55
Q

How do you insert an ammeter

A

Series

56
Q

How to you insert a voltmeter

A

Parallel

57
Q

What do you want from a voltmeter

A

High resistance

58
Q

What do you want from an Ameter

A

Low resistance

59
Q

1 coulomb is equal to how many electrons

A

6.24 x 10^18

60
Q

Why is there inert gas in a filament bulb

A

To protect the filament

61
Q

What happens to the mercury in a filament bulb

A

Vaporises causing a current path

Module 3 - Electrical Systems (3 decks)

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