Renewable Energy

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Questions and Answers

What are the two methods for generating solar energy?

Photovoltaic and hydroelectric power

Thermal steam and wind power

Thermal electric and photovoltaic power (correct)

Nuclear and geothermal power

Where is geothermal energy most accessible?

Along the earth's crustal plate boundaries (correct)

In the middle of the ocean

In the polar regions

In the desert

What is tidal power?

A well-researched and proven source of energy from oceans (correct)

A new, untested source of energy from oceans

A type of wind energy generated by ocean currents

A type of solar energy generated by the reflection of sunlight off the ocean's surface

What is the primary reason renewable energy is not as cost competitive as fossil fuels?

Insufficient effort and financing Signup and view all the answers

What is the most widely used renewable energy source?

Hydropower Signup and view all the answers

How do solar thermal electric generators produce electricity?

By using mirrors to heat fluid and produce steam Signup and view all the answers

What is the main challenge facing renewable energy development?

Political issues Signup and view all the answers

Which country holds more than half of the world's primary geothermal energy supply?

Iceland Signup and view all the answers

What is a benefit of using tides for energy?

Tides are predictable and reliable, with no pollution Signup and view all the answers

What is the estimated potential for wind energy to meet global electricity demand?

20% Signup and view all the answers

What type of geothermal systems are mostly hydrothermal?

Aquifers of hot water Signup and view all the answers

What is the expected trend for energy demand?

Continue rising Signup and view all the answers

What is the process behind photovoltaic power?

Absorbing photons in a semi-conductor Signup and view all the answers

What can barrages do?

Protect coastlines against storm surges Signup and view all the answers

Which two regions have made major investments in wind power?

Denmark and California Signup and view all the answers

What percentage of Denmark's electricity is projected to come from offshore wind farms by 2025?

80% Signup and view all the answers

In what areas is solar energy cost-effective?

Remote areas Signup and view all the answers

What is the advantage of renewable energy in terms of construction?

Small equipment Signup and view all the answers

What are some environmental challenges associated with geothermal energy?

Drilling, air and noise pollution, and disposal of waste Signup and view all the answers

What is the main source of energy in many developing countries?

Bioenergy Signup and view all the answers

What are some environmental issues related to wind energy?

Noise and interference Signup and view all the answers

What are some environmental concerns with tidal energy?

Changes to hydro-dynamics Signup and view all the answers

Will geothermal energy make significant contributions to global energy needs?

Unlikely Signup and view all the answers

What is an alternative to barrages for tidal energy?

Rotation shafts with turbines Signup and view all the answers

What are the two forms of bioenergy?

Processed and unprocessed biomass Signup and view all the answers

What potential impacts do offshore wind farms have on marine environments?

Alteration of sediment flow Signup and view all the answers

Which countries have high potential and low energy demand for geothermal energy?

Djibouti, El Salvador, Kenya, Philippines, and Nicaragua Signup and view all the answers

What is needed to advance renewable energy technologies?

Research, development, and demonstration Signup and view all the answers

What mitigation strategy is suggested for the impacts of offshore wind farms on marine environments?

Artificial reefs Signup and view all the answers

Which country has potential for tidal energy but has focused on hydropower?

Canada Signup and view all the answers

What is the future potential of bioenergy?

It has high potential for significant contribution to global energy supply Signup and view all the answers

In which regions does hydropower have potential for future development?

Developing countries and the Soviet Union Signup and view all the answers

Which body of water has one of the largest tidal ranges in the world?

The Bay of Fundy Signup and view all the answers

Since when has geothermal energy been commercially exploited for heat, mechanical power, and electricity?

Early 1900s Signup and view all the answers

What are some sources of biomass?

Industrial and agricultural residue, municipal waste, energy plantations, and oil seed Signup and view all the answers

When was a tidal energy plant established in Annapolis?

1984 Signup and view all the answers

What percentage of California's electricity is currently provided by wind energy?

7% Signup and view all the answers

Is geothermal energy a renewable energy source?

Yes Signup and view all the answers

What is the main advantage of tidal energy over fossil fuels?

It produces less pollution Signup and view all the answers

Which country has the world's first offshore wind farm?

Denmark Signup and view all the answers

What was the primary source of energy before the switch to fossil fuels during industrialization?

Bioenergy Signup and view all the answers

What is the main challenge facing renewable energy development in terms of information and education?

Insufficient education and training Signup and view all the answers

What is the main disadvantage of tidal energy compared to wind or solar energy?

It is only available in certain locations Signup and view all the answers

Which of the following is not a method for generating solar energy?

Thermal electric power Signup and view all the answers

What percentage of Denmark's electricity is currently generated from offshore wind farms?

43% Signup and view all the answers

Where are the greatest potential impacts of offshore wind farms likely to occur?

Underwater Signup and view all the answers

Which of the following is not a source of biomass?

Solar panels Signup and view all the answers

What is the potential impact of tidal energy on marine life?

It could harm marine life by disrupting ecosystems Signup and view all the answers

Study Notes

Hydropower is the most widely used renewable energy source, but faces constraints related to social and environmental impacts.
Wind energy has potential to meet future electricity demands, with estimates projecting up to 20% of global demand.
California and Denmark have made major investments in wind power, with Denmark projected to generate up to 80% of its electricity from offshore wind farms by 2025.
Environmental issues related to wind energy include noise, interference, land requirements, and aesthetics.
Offshore wind farms have potential impacts on marine environments, including alteration of sediment flow and composition of species.
Artificial reefs at the base of wind turbines may help mitigate impacts.
Hydropower has potential for future development, especially in developing countries and the Soviet Union.
Wind energy currently provides approximately 7% of California's electricity through 7500 turbines.
Denmark has the world's first offshore wind farm and currently generates about 43.6% of its electricity from offshore wind farms.
The greatest potential impacts of offshore wind farms on marine environments are likely to occur underwater.

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Review Quiz for Powering Earth - Renewable Energy