What is one of the main technologies used to convert sunlight directly into electricity?

• Photovoltaic (PV) systems

• Solar thermal systems

• Wind turbines

• Hydropower plants

What percentage of electricity generation in the United States is contributed by solar energy?

• 3 percent

• 10 percent

• 15 percent

• 20 percent

Which of the following is NOT a direct use of solar energy?

• Wind energy

• Photovoltaic systems

• Solar thermal systems

• Hydropower

What is a major challenge facing solar energy?

• Storage and transportation

• High air pollution

• Limited availability

• Excessive greenhouse gas emissions

What environmental impact is associated with solar panels?

• Manufacturing process

• Operation emissions

• Water usage

• Noise pollution