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Grade 12 > Unit 8 : Renewable Energy > Flashcards

Unit 8 : Renewable Energy Flashcards

1
Q

Why do we need energy sources?

A

We need energy sources for our cars, trains, planes, machines, appliances, and many other energy-consuming vehicles and devices.

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2
Q

What are the examples of fossil fuels and what are they used for?

A

The examples of fossil fuels are coal, oil and gas, and they are used for our cars, trains, planes, machines, appliances, and many other energy-consuming vehicles and devices.

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3
Q

How is the CO2 in the atm increasing?

A

CO2 in the atm is increasing dramatically.

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4
Q

Why is it essential for us to use renewable energy instead of burning fossil fuels?

A

Because the earth is running out of fossil fuels, which means that there is a need for alternative sources of energy for use on a wide scale.

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5
Q

What does renewable energy refer to?

A

Renewable energy refers to energy that is produced using the sun, wind, water, etc. (rather than using fuels such as oil, gas and coal).

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6
Q

What are the rich sources of renewable energy?

A

The rich sources of renewable energy are sun, wind, water, waste and heat.

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7
Q

What are the two benefits of using renewable energy?

A
  • are that these energy sources can never run out or are inexhaustible and they can be produced without causing CO2 emissions, air pollution and global warming.
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8
Q

What are the drawbacks of using hydropower?

A
  • are that water-powered tubines can have a negative effect on aquatic wildlife, building hydropower dams can cause the land behind the dams to flood and the costs of installing hydropower systems are high.

3 drawbacks

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9
Q

How is the process of creating wind power different from that of hydropower?

A
  • by the process of creating wind power being relatively cheap and considered one of the most affordable forms of energy today.
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10
Q

How is electricity generated from the sun?

A
  • when sunlight hits the photovoltaic cells on specially designed panels.
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11
Q

What are the benefits of using solar energy for the environment?

A
  • are that it helps control air pollution, it causes no noise and sunlight is a renewable source that can never get used up.

3 benefits

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12
Q

How long does it take to form fossil fuels?

A

It takes hundreds of millions of years to form fossil fuels.

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12
Q

What is biomass?

A

Biomass is a biologically produced fuel made from dead plant and animal materials.

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12
Q

What are the examples of renewable energy sources?

A
  • hydropower, wind power, solar energy, biomass energy and geothermal energy.
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12
Q

Where can the most active geothermal resources be found?

A
  • can be found in areas near volcanoes.
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13
Q

What are the advantages of using wind turbines?

A
  • are that the process is relatively cheap and is also considered one of the most affordable forms of energy today and it doesn’t have harmful effects on the air and land it uses.

3 advantages

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14
Q

When is electricity generated?

A

Electricity is generated when moving water turns turbines.

15
Q

How is energy generated?

A

Energy is generated when the wind turns wind turbines.

16
Q

How is electricity generated in solar energy?

A
  • when sunlight hits the photovoltaic cells on specially designed panels in solar energy.
17
Q

How can the burning of biomass be used?

A
  • to produce steam which turns turbines and generates electricity.
18
Q

What does geothermal use?

A

Geothermal uses the heat within the earth to produce electricity and heat buildings.

19
Q

What is biomass made up of?

A

Biomass is made up of rubbish and other organic waste.

20
Q

What does hydropower utilise?

A
  • the power of moving water such as waterfalls and rivers and the sea.
20
Q

When is power generated with dams?

A

Power is generated when water from the dam is released through turbines.

21
Q

How to create wind power?

How is wind power created?

A

To create wind power, large turbines are placed on top of hills or offshore.

Wind power is created by placing large turbines on top of hills or offshore.

22
Q

What makes wind power similar to hydropower?

A
  • wind turbines can also be a threat to wildlife, such as birds or bats in areas.
22
Q

What does the efficiency of the solar panels depend on?

A
  • depends on their location (the sunnier the place, the more efficient they are).
22
Q

What is one disadvantage of wind turbines/power?

A
  • is that when the wind stops blowing, all wind turbines stop working.
23
Q

Where is solar energy popular?

A

Solar energy is popular in remote areas.

24
Q

What is solar power’s alternative?

A

Solar power is used as a green alternative to power homes and buildings that are connected to the electric grid.

24
Q

What is the process of the conversion of sunlight into electricity?

A
  • is solar energy.
24
Q

What is biomass considered?

A
  • oldest source of renewable energy.
25
Q

What are some people worried about?

A

Some people are worried that burning biomass causes global warming because it produces greenhouse gases.

25
Q

What does geothermal energy use?

A
  • uses heat within the earth to produce electricity and heat buildings.
26
Q

What can the heat trapped in the ground be converted?

A
  • into steam to turn turbines.
27
Q

What kind of technology does geothermal energy use?

A

Geothermal energy uses relatively simple technology.

28
Q

What do climatologists agree?

A

Climatologists agree that many environmental problems we are facing today are mainly caused by the consumption of huge amounts of fossil fuels.

29
Q

What is the biggest challenge we all are facing?

A
  • is to stop burning fossil fuels and start using renewable energy.
30
Q

How is geothermal energy produced?

A

Geothermal energy is produced by using the heat within the earth.

31
Q

What has destroyed our natural environment?

A

Buring fossil fuels for decades has destroyed our natural environment.

Grade 12 (13 decks)

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