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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
What's energy measured in?
Watt-hours (Wh) or joules (J)
25
How do you find power?
Divide energy by time
26
What's power measured by?
Watts (W)
27
How do you calculate time?
Divide energy by power
28
How is time measured?
Hours (h) or seconds (s)
29
When is time calculated by hours?
When energy is measured in Wh of kWh
30
When is time measured with s?
When energy is measured in joules
31
kWh?
Kilowatthours
32
What does kWh = in Wh
1 kWh = 1000 Wh
33
How do you calculate cost?
Energy x rate
34
Rate?
($/kWh)
35
What's Ohm's Law?
The voltage between 2 points of a conductor is directly related to the current flowing through the conductor
36
How is Ohm's law calculated?
V= IxR
37
How do you calculate voltage?
- Multiply resistance by current | - divide power by current
38
What's voltage measured in?
Volts (V)
39
How do you calculate current?
- V/R | - P/V
40
What's current measured in?
Amperes (A)
41
How do you calculate resistance?
V/I
42
What's the measure and symbol for resistance?
- olms (weird symbol)
43
How do you calculate power?
P = VxIg
44
What's power measured in?
Watts (W)
45
How many mA's are in a A
1000 mA = 1 A
46
Power?
The rate that a device converts electricity into another form of energy
47
What's the function of a battery?
To provide energy
48
What's the function of a wire?
To allow ē's to travel
49
What's the function of a switch?
To manage the flow of ē's
50
What's the function of a fuse?
To protect a circuit from damage?
51
What's the function of a light bulb?
To convert energy into light and/or heat
52
What's the function of a resistor?
To decrease the speed in which energy travels through a circuit
53
What's the function of a Voltmeter?
To measure the amount of volts (energy) in a device
54
What's the function of a ammeter?
To measure the flow rate of ē's
55
What's the function of a motor?
Converts energy into kinetic energy?
56
What's the symbol for a battery?
A long vertical line beside a short one
57
What's the symbol for wire?
A line
58
What's the symbol for a switch? (Open)
A tiny circle connected to a diagonal line than following another tiny circle
59
What's the symbol for a switch? (Closed)
A tiny circle connected to a straight line than following another tiny circle
60
What's the symbol for a lightbulb?
A line with a loop
61
What's the symbol for a resistor?
Heart beat line
62
What's the symbol for a voltmeter?
A circle with a V
63
What's the symbol for a ammeter?
A circle with a A
64
What's the symbol for a motor?
A circle with a M
65
Voltage?
The difference in electric potential energy or stored up energy
66
Short Circuit?
A current that only contains a source and a conductor
67
What's the symbol for a fuse?
Same as a closed switch but the line is squiggly in between the circles
68
Renewable energy?
A source that can be reused or replaced
69
What are 2 examples of a renewable source
1. Solar 2. Wind 3. Tidal 4. Hydro 5. Biomass 6. Neuclear
70
What are 2 examples of a non-renewable source?
1. Gas-fire 2. Gasoline-generator 3. Coal
71
What are 3 benefits of hydraulic power?
- electricity is cheap - can be used for flow control, drinking water, and irrigation - is practical for certain communities
72
What are 2 benefits of fossile fuels?
- fossil fuel stations are easily adjustable and electrically changeable
73
What are 2 benefits of Nuclear power?
- inexpensive to produce | - efficient with more power less fuel
74
What are 2 benefits of solar power?
- Convient source for small devices | - useful in remote areas
75
What are 3 costs of solar power?
- low efficiency - take's up large area's of land - most expensive source of energy
76
What are 2 costs of nuclear power?
- poisonous and radioactive | - the plants are expensive to build and to maintain
77
What are 2 costs of fossil fuel?
- directly contributes to global warming with pollution | - mining for coal is dangerous for miners and wildlife
78
What are 2 costs of hydraulic power?
- can destroy or disturb land, wildlife, and/or migration routes - expensive to build
79
Turbine?
A machine that uses the flow of a fluid to turn a shaft
80
How do turbines creat energy?
They contain a copper wire. When turned they separate the atoms and transfer them to the copper wire.
81
Solar?
Renewable
82
Wind?
Renewable
83
Hydro?
Renewable
84
Tidal?
Renewable
85
Biomass?
Renewable
86
Nuclear?
Renewable
87
Gas-fire?
Non-renewable
88
Gasoline-generator?
Non-renewable
89
Coal?
Non-renewable
90
What turns the turbines for fossil fuels, biomass, geothermal, and nuclear?
Steam
91
What energy source does not us a turbine?
Solar
92
What energy source is the most expensive?
Solar
93
What is the original source of energy for nuclear?
Uranium
94
What is the original source of energy for tidal?
Tides that are gravitationally pulled by the moon
95
What is the original source of energy for biomass?
Waste of plants and animals

Flash Cards (32 decks)

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