The video discusses the Hoover Dam as an example of renewable energy, producing electricity without fossil fuels. It introduces renewable energy sources like solar, hydroelectric, ocean, wind, and geothermal energy. Solar energy is harnessed through photovoltaic cells and parabolic troughs. Hydroelectric power is generated by dams, while ocean energy utilizes tides and waves. Wind energy is captured by windmills, and geothermal energy uses Earth's heat. The video emphasizes the importance of renewable energy and encourages further learning.

What is the height of the Hoover Dam from its base to the top?

• 80 stories

• 70 stories

• 60 stories

• 50 stories

Which of the following is NOT a renewable energy source mentioned in the video?

• Nuclear

• Wind

• Geothermal

• Solar

What percentage of the United States' energy needs is currently met by solar power?

• 10%

• 3%

• 1%

• 5%

Which device converts sunlight directly into electrical energy?

• Wind turbine

• Geothermal pump

• Hydroelectric dam

• Photovoltaic cell

What is the primary method of generating hydroelectric power?

• Using windmills

• Constructing dams

• Building solar panels

• Harnessing geothermal steam

Which type of ocean energy is currently not commercially operated in the United States?

• Tidal energy

• Wave energy

• Wind energy

• Solar energy

What is the largest source of renewable energy in the United States?

• Solar energy

• Geothermal energy

• Wind energy

• Hydroelectric energy

How does wind energy generate electricity?

• By using photovoltaic cells

• By spinning a propeller connected to a generator

• By using geothermal steam

• By capturing ocean tides

What is the current contribution of geothermal power plants to the U.S. energy supply?

• 15%

• 5%

• Less than 1%

• 10%

Which renewable energy source involves using steam from inside the Earth?

• Geothermal energy

• Wind energy

• Solar energy

• Hydroelectric energy