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Electronics Theory > Electricity - Module 1 > Flashcards

Electricity - Module 1 Flashcards

1. Describe the atomic structure of matter 2. Describe the units of electrical charge, current and voltage 3. Describe the factors that affect the movement of electrical charges

1
Q

What are the 3 types of sub-atomic particles?

A

Electron Neutron Proton

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2
Q

What are each of the sub-atmoic particle charges?

A 
Electron = Negative
Proton = Positive
Neutron = Neutral
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3
Q

What are the electrons on the outer shell called?

A

Valence electrons or valence shell

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4
Q

What is electrical polarity?

A

When there is an accumulation or lack of electrons
Lack of = positive polarity
Accumulation = negative polarity

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5
Q

What is a conductor and how does it work?

A

A conductor is a material that allows electricity to flow easily due to its valence electrons being easily detachable from the nucleus

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6
Q

What is conventional and electron flow?

A

Conventional flow is the flow of the current moving through a circuit from positive to negative
Electron flow is the opposite of conventional flow, electrons flow from negative to positive terminal

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7
Q

What is an insulator? Why does it do what it does?

A

An insulator does NOT allow electricity to flow due to having difficult valence electrons that do not conduct electrical charges

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8
Q

What is a semiconductor? What is their importance?

What is an example of a semiconductor?

A

Semiconductors are neither conductors nor insulators. They allow a specific amount of electrons to flow through them due to their structure. (4 valence electrons that create crystalline formations)

Silicon is a semiconductor

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9
Q

Examples of Conductors

A

Metals such as copper, silver, gold, etc.

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10
Q

Examples of insulators

A

Glass, Rubber, wood

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11
Q

How does a battery work in terms of charges?

A

The negative end repels electrons and the positive end attracts electrons. This is facilitated through a chemical reaction.

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12
Q

What form of electricity happens when you rub your feet on a carpet?

A

Static electricity

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13
Q

Unlike charges_____and like charges______

A

Attract, Repel

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14
Q

What is a coulomb? What is it equal to?

A

It is the unit of electrical quantity or charge

An Ampere is used to calculate Coulombs

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15
Q

What is the definition of Current?

A

Current is the flow of electrons through a circuit in a single direction

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16
Q

What is an Ampere? What do we use to measure this?

A

An ampere is the measurement of electric current through a circuit (An ampere is a measurement of the current)

An ammeter is used to measure the amperes

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17
Q

How is energy defined? What are the 2 types?

A

Energy is the capacity for performing work

Kinetic and Potential

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18
Q

What is the force that forces current through a wire called? What is an example?

A

Electromotive force (emf)

A Battery is an emf

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19
Q

What is the definition of Voltage?

A

The amount of electrical pressure that exists between two points

20
Q

How many electrons are inside 1 coulomb?

A

6.25 x 10^18

21
Q

What is the current of a wire if 150 C of charge pass by in 25 seconds?

A

6amps (I = Q/T) (Current = QUANTITY OF COULOMBS divided by TIME

22
Q

What is an Ohm?

A

An Ohm measures the resistance in a circuit

23
Q

The______of a conductor is directly proportional to its length

A

Resistance,

24
Q

There are 2 factors that affect the resistance of a conductor. What are they?

A

Length, Type

25
Q

If voltage increases, current_______

A

increases

26
Q

If resistance decreases, current________

A

increases

27
Q

If voltage decreases, current_______

A

decreases

28
Q

If resistance increases, current______

A

decreases

29
Q

If voltage increases, resistance________

A

stays the same

30
Q

If resistance increases, voltage_______

A

stays the same

31
Q

If resistance is halved, current is _______

A

doubled

32
Q

If resistance is doubled, current is ______

A

Halved

33
Q

What is direct current?

A

DC is the flow of electrons in one direction only, and is constant and consistent

34
Q

What is Alternating Current?

A

AC is the direction of electrons flowing in one direction then into the other direction (polarity switches)

35
Q

What is pulsating DC?

A

The flow of electrons in a single direction in a pulsing waveform. The polarity of the electrons do not reverse.

36
Q

What is it called when a magnetic field is established around a current carrying conductor?

A

Electromagnetic generation

37
Q

What happens to the steel bar if we were to flip the current through the coil?

A

The poles (North and South, negative and positive) would flip

38
Q

How do rotating machines create commercial electricity? What is the process called?

A

The process is called electromagnetic induction

39
Q

What are the 4 sources of an emf? (How can we create an emf?)

A

Electromagnetic Induction
Piezoelectric Sources
Photovoltaic Sources
Thermoelectric Sources

40
Q

What is the electricity?

A

The flow of electrons from one atom to the next

41
Q

What makes a material a conductor, insulator, or semiconductor?

A

How easy or difficult it is to dislodge the valence electrons

42
Q

Silicon is a ___________

A

semiconductor

43
Q

Glass, Rubber, plastics are examples of__________

A

insulators

44
Q

Metals that have an abundance of free electrons are known as __________

A

conductors

45
Q

What is the region on a conductor where magnetic properties are produced?

A

The magnetic field

Electronics Theory (2 decks)

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