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GCSE D.T > Renewable Energy, planned obsolenence and metals > Flashcards

Renewable Energy, planned obsolenence and metals Flashcards

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1
Q

What are the advantages of using coal?

A
  • There is enough coal on earth to last hundreds of years

- Produces high amounts of energy

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2
Q

What are te disadvantages of coal?

A
  • Produces carbon dioxide

- Damage to natural land where mining takes place

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3
Q

What are the advantages of natural gas?

A
  • emits less carbon dioxide than coal or oil

- the UK has shale gas deposites

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4
Q

What are the disadvantages of natural gas?

A
  • gas is highly flamable

- extracting gas might cause the pollution of water

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5
Q

What is fracking?

A

A process of forcing liquid and sand into shale rock to force oil or gas out

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6
Q

What are the advantages of oil?

A
  • small amount of oil produces a lot of energy

- easy to store and transport

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7
Q

What are the disadvantages of oil

A
  • creates significant air pollution when burned

- considerable impact on water, land use and disposal

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8
Q

What are the advantages of nuclear power?

A
  • no harmful gases are released

- more efficiant than fossil fuels

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9
Q

What are the disadvantages of nuclear power?

A
  • power stations have to close after around 40 years of use
  • disposal of waste is difficult and costly
  • cost of nuclear power stations is very high
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10
Q

What are the advantages of wind turbines?

A
  • wind is constantly available

- low running costs

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11
Q

What are the disadvantages of wind turbines?

A
  • will noot work as effectivly if there is little to no wind
  • initial set up cost is high
  • some people do not like the look of them
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12
Q

What are the advantages of solar pannels?

A
  • clean, renewable energy

- reduces household energy bills

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13
Q

What are the disadvantages of solar pannels?

A
  • Some people do not like the look of them
  • Initial set up cost is high
  • At night or during winter they will not produce electricity
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14
Q

What are the advantages of tidal power?

A
  • clean, renewable energy
  • power plants last for a long time
  • could produce 1/5 of the UK’s needs
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15
Q

What are the disadvantages of tidal power?

A
  • initial set up cost are high

- could have an environmental impact

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16
Q

What are the advantages of hydroelectric power?

A
  • clean, renewable energy
  • valves can be opened quickly to produce more energy at peak times
  • no pollution when running
17
Q

What are the disadvantages of hydroelectric power?

A
  • initial set up cost is high
  • takes up a lot of space
  • affects wildlife habitats because of the flooding
18
Q

What are the advantages of biomass?

A
  • clean, renewable enrgy source
  • carbon dioxide is released but it can be reused by plants
  • replacement plants can be grown quickly
19
Q

What are the disadvantages of biomass?

A
  • does create pollution when burnt (produces CO2)

- need large amount of land to grow plants

20
Q

What is planned obsolescence?

A

It is when a designer deliberately gives a product a short life span.

21
Q

What are the advantages of planned obsolescence?

A

Companies are able to convice there customers to buy the new and improved versions.

22
Q

What are the disadvanteges of planned obsolescence?

A

It creates more waste so is bad for the environment.

23
Q

What is a metal alloy?

A

It is made by combining different metals which makes it more useful for a specific task

24
Q

How do you calculate the cost of metals?

A

Cost = cost per tonne x weight required

25
Q

What is a ferrous metal?

A

A metal that contains iron (so will be magnetic and will rust)

26
Q

What is a non-ferrous metal?

A

A metal that doesnt contain iron (so wont rust)

27
Q

What are some example of alloys?

A
  • High speed steel
  • Stainless steal
  • Brass
28
Q

What are the properties of stainless steel?

A
  • strong
  • wont rust
  • used in surgical equipment
29
Q

Why are metals good to use in the kitchen?

A

They are used in cooking utensils because they are strong, dont easily rust, have a high melting point and are safe with use of food.

30
Q

Why are metals good to use as hand tools?

A

Steel is hard, tough and strong so it wont break.

31
Q

How can you modify metals?

A

You can heat them to make them more malleable and change their shape.

32
Q

What is an example of a non-ferrous metal

A

Copper - soft, malleable, good electriical conductor (e.g. used in electrical wiring)

33
Q

What is an example of a ferrous metal?

A

Cast iron - strong, not malleable (e.g. used in bench vices and car brake discs)

GCSE D.T (2 decks)

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