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Flash Cards > Grade 9 Science - Electricity > Flashcards

Grade 9 Science - Electricity Flashcards

0
Q

Insulators?

A

Materials that hold onto ē’s but don’t allow them to move freely through tgem

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1
Q

What’s Conductivity?

A

The ability a material allowing ē’s to pass through objects

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2
Q

Are insulators or conductors only in one state?

A

No

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3
Q

What are 5 examples of an insulator?

A
  1. Rubber
  2. Glass
  3. Plastic
  4. Pure water
  5. Rust
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4
Q

What are 5 examples of a Conductor?

A

Whatever’s metal

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5
Q

What are 5 examples of a semiconductor?

A
  1. Mineraled water
  2. Air
  3. Human body
  4. Carbon
  5. Soil
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6
Q

Semiconductor?

A

Materials that only allow some movement of ē’s

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7
Q

Why should you not use water to put out an electrical fire?

A

Because electricity travels at the speed of light so once the water hits the electricity it’ll go through the water back to you within milliseconds of you tossing the water

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8
Q

What’s the most common way for ē’s to be transferred?

A

Through friction

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9
Q

What is a less effective way for ē’s to be transferred other than friction?

A

Through contact or conduction

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10
Q

Conduction?

A

When ē’s transfer from a charged object to a neutral object. The object will than gain the same charge as the charged object that had made contact

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11
Q

If a positively charged object touches a neutral object what happens?

A

The ē’s from the neutral object transfer to the positively object to help balance the charge. This results in the neutral object now being positive and the positively charged object is now less positive

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12
Q

If a negitivaly charged object touches a neutral object what happens?

A

The ē’s from the negatively object transfer to the neutral object to help balance the charge. This results in the neutral object now being negative and the negatively charged object is now less negative

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13
Q

Can Static electricity be used to operate electrical devices?

A

No

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14
Q

What’s needed to operate electrical devices?

A

A steady flow of electrons

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15
Q

What are the 3 main parts to a circuit?

A
  1. The source
  2. A conductor
  3. A load
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16
Q

What are the 2 conditions to having a continuous flow in a circuit?

A
  1. An energy source

2. A complete path

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17
Q

What’s a load?

A

A device that converts electrical energy into another form of energy

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18
Q

Current electricity?

A

The continuous flow of ē’s in a circuit

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19
Q

What else other than the 3 parts can circuit have?

A

A switch

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20
Q

Switch

A

A device that manages the flow of ē’s

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21
Q

Switch is open

A

Off

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22
Q

Switch is closed

A

On

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23
Q

How do you find energy

A

By multiplying power by time

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24
Q

What’s energy measured in?

A

Watt-hours (Wh) or joules (J)

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25
Q

How do you find power?

A

Divide energy by time

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26
Q

What’s power measured by?

A

Watts (W)

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27
Q

How do you calculate time?

A

Divide energy by power

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28
Q

How is time measured?

A

Hours (h) or seconds (s)

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29
Q

When is time calculated by hours?

A

When energy is measured in Wh of kWh

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30
Q

When is time measured with s?

A

When energy is measured in joules

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31
Q

kWh?

A

Kilowatthours

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32
Q

What does kWh = in Wh

A

1 kWh = 1000 Wh

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33
Q

How do you calculate cost?

A

Energy x rate

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34
Q

Rate?

A

($/kWh)

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35
Q

What’s Ohm’s Law?

A

The voltage between 2 points of a conductor is directly related to the current flowing through the conductor

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36
Q

How is Ohm’s law calculated?

A

V= IxR

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37
Q

How do you calculate voltage?

A
  • Multiply resistance by current

- divide power by current

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38
Q

What’s voltage measured in?

A

Volts (V)

39
Q

How do you calculate current?

A
  • V/R

- P/V

40
Q

What’s current measured in?

A

Amperes (A)

41
Q

How do you calculate resistance?

A

V/I

42
Q

What’s the measure and symbol for resistance?

A
  • olms (weird symbol)
43
Q

How do you calculate power?

A

P = VxIg

44
Q

What’s power measured in?

A

Watts (W)

45
Q

How many mA’s are in a A

A

1000 mA = 1 A

46
Q

Power?

A

The rate that a device converts electricity into another form of energy

47
Q

What’s the function of a battery?

A

To provide energy

48
Q

What’s the function of a wire?

A

To allow ē’s to travel

49
Q

What’s the function of a switch?

A

To manage the flow of ē’s

50
Q

What’s the function of a fuse?

A

To protect a circuit from damage?

51
Q

What’s the function of a light bulb?

A

To convert energy into light and/or heat

52
Q

What’s the function of a resistor?

A

To decrease the speed in which energy travels through a circuit

53
Q

What’s the function of a Voltmeter?

A

To measure the amount of volts (energy) in a device

54
Q

What’s the function of a ammeter?

A

To measure the flow rate of ē’s

55
Q

What’s the function of a motor?

A

Converts energy into kinetic energy?

56
Q

What’s the symbol for a battery?

A

A long vertical line beside a short one

57
Q

What’s the symbol for wire?

A

A line

58
Q

What’s the symbol for a switch? (Open)

A

A tiny circle connected to a diagonal line than following another tiny circle

59
Q

What’s the symbol for a switch? (Closed)

A

A tiny circle connected to a straight line than following another tiny circle

60
Q

What’s the symbol for a lightbulb?

A

A line with a loop

61
Q

What’s the symbol for a resistor?

A

Heart beat line

62
Q

What’s the symbol for a voltmeter?

A

A circle with a V

63
Q

What’s the symbol for a ammeter?

A

A circle with a A

64
Q

What’s the symbol for a motor?

A

A circle with a M

65
Q

Voltage?

A

The difference in electric potential energy or stored up energy

66
Q

Short Circuit?

A

A current that only contains a source and a conductor

67
Q

What’s the symbol for a fuse?

A

Same as a closed switch but the line is squiggly in between the circles

68
Q

Renewable energy?

A

A source that can be reused or replaced

69
Q

What are 2 examples of a renewable source

A
  1. Solar
  2. Wind
  3. Tidal
  4. Hydro
  5. Biomass
  6. Neuclear
70
Q

What are 2 examples of a non-renewable source?

A
  1. Gas-fire
  2. Gasoline-generator
  3. Coal
71
Q

What are 3 benefits of hydraulic power?

A
  • electricity is cheap
  • can be used for flow control, drinking water, and irrigation
  • is practical for certain communities
72
Q

What are 2 benefits of fossile fuels?

A
  • fossil fuel stations are easily adjustable and electrically changeable
73
Q

What are 2 benefits of Nuclear power?

A
  • inexpensive to produce

- efficient with more power less fuel

74
Q

What are 2 benefits of solar power?

A
  • Convient source for small devices

- useful in remote areas

75
Q

What are 3 costs of solar power?

A
  • low efficiency
  • take’s up large area’s of land
  • most expensive source of energy
76
Q

What are 2 costs of nuclear power?

A
  • poisonous and radioactive

- the plants are expensive to build and to maintain

77
Q

What are 2 costs of fossil fuel?

A
  • directly contributes to global warming with pollution

- mining for coal is dangerous for miners and wildlife

78
Q

What are 2 costs of hydraulic power?

A
  • can destroy or disturb land, wildlife, and/or migration routes
  • expensive to build
79
Q

Turbine?

A

A machine that uses the flow of a fluid to turn a shaft

80
Q

How do turbines creat energy?

A

They contain a copper wire. When turned they separate the atoms and transfer them to the copper wire.

81
Q

Solar?

A

Renewable

82
Q

Wind?

A

Renewable

83
Q

Hydro?

A

Renewable

84
Q

Tidal?

A

Renewable

85
Q

Biomass?

A

Renewable

86
Q

Nuclear?

A

Renewable

87
Q

Gas-fire?

A

Non-renewable

88
Q

Gasoline-generator?

A

Non-renewable

89
Q

Coal?

A

Non-renewable

90
Q

What turns the turbines for fossil fuels, biomass, geothermal, and nuclear?

A

Steam

91
Q

What energy source does not us a turbine?

A

Solar

92
Q

What energy source is the most expensive?

A

Solar

93
Q

What is the original source of energy for nuclear?

A

Uranium

94
Q

What is the original source of energy for tidal?

A

Tides that are gravitationally pulled by the moon

95
Q

What is the original source of energy for biomass?

A

Waste of plants and animals

Flash Cards (32 decks)

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