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Physics - S1 > Energy > Flashcards

Energy Flashcards

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Physics 101 flashcards AP® Physics flashcards
1
Q

Recall some forms of Energy

A

Chemical, electrical, light, strain, thermal, sound, magnetic, kinetic, gravitational potential

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2
Q

State an example of Chemical energy

A

battery, food

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3
Q

State an example of electrical energy

A

lightbulb, switch

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4
Q

State an example of strain energy

A

elastic band

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5
Q

State an example of light energy

A

sun, lightbulb

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6
Q

State an example of gravity potential energy

A

holding up an object

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7
Q

State an example of thermal energy

A

sun, fire

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8
Q

State an example of sound energy

A

speaker, drill

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9
Q

State an example of magnetic energy

A

magnet

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10
Q

State an example of kinetic energy

A

bike, car

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11
Q

What is the the principle of conservation of energy?

A

‘The principle of conservation of energy states that energy cannot be created or destroyed merely transferred from one form to another

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12
Q

What is one Joule approximately the energy that is needed to do?

A

1J is approximately the energy needed to lift an apple vertically up 1m.

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12
Q

What does all energy eventually become?

A

Thermal energy

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13
Q

What is energy measured in?

A

joules - J

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14
Q

What do energy transfer diagrams show?

A

Energy in ——> device ——–> Energy out

The transfer of energy

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15
Q

Sankey Diagrams

A

look in book

16
Q

What is renewable energy?

A

Renewable energy is defined as energy that is collected from resources that will never run out or which are naturally replenished within a human lifetime

17
Q

What are the Advantages of Sunlight

A

Free
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream.

18
Q

What are the Advantages of wind

A

Free
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream

19
Q

What are the Advantages of Hydroelectric

A

Free electric
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream.
Can control when power is
produced.

20
Q

What are the Advantages of Tidal

A

Free electric
No GHG emitted.
Will not run out.
Reduce energy bills.
Develop a revenue stream.
Predictable power output.

21
Q

What are the Advantages of Waves

A

Free electric
No GHG emitted.
Will not run out.
Develop a revenue stream.
Predictable power output

22
Q

What are the Advantages of Geothermal heat

A

Free.
No GHG emissions.
Reduce bills.
Hot water can be
stored.

23
Q

What are the Advantages of Woods

A

Will not run out (if replanted)
Can be stored for future use.
Can be grown locally

24
Q

What are the Disadvantages of Sunlight

A

Intermittent
Low values near each pole.

25
Q

What are the Disadvantages of Wind

A

Intermittent
High initial costs.

26
Q

What are the Disadvantages of Hydroelectric

A

Need the correct topography of ground.
Huge initial investment.

27
Q

What are the Disadvantages of Tidal

A

Need the correct topography of ground.
large initial investment.

28
Q

What are the Disadvantages of Waves

A

Oil spills.
Habitat destruction.
Visual impact.

29
Q

What are the Disadvantages of Wood

A

Overuse.
Does give out CO2.

30
Q

What is efficiency?

A

Efficiency is a measure of how good a device is at changing energy from one form to another.

31
Q

What are the Disadvantages of Geothermal heat

A

Expensive to set up.
Leaks into ground.

32
Q

Can a device have 100% efficiency?

A

No, as all devices waste energy

33
Q

Why is an energy efficient light bulb is more efficient than a filament bulb.

A

It wastes less energy and coverts a greater proportion of the energy supplied into light energy and not heat.

34
Q

How is energy efficiency calculated?

A

Energy efficiency = Useful Output Energy/Total Input Energy eff = Eout/Ein

Useful and total energy is measured in Joules - J

35
Q

Why is it important that electrical appliances display information about their energy efficiency.

A

It helps the consumer to identify which appliance will use the least energy and cost the least to run.

36
Q

What are the units of energy efficiency?

A

It does not have any units, it is a number between 0-100 which can be converted into a percentage by multiplying by 100

Physics - S1 (14 decks)

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