Hydroelectricity and Tidal Barrage

• What are the two systems used to generate electrical power discussed in the video?

  Hydroelectric dams and tidal barrages
• How do hydroelectric dams and tidal barrages generate electricity?

  By using differences in water levels
• What is the main difference between hydroelectric dams and tidal barrages?

  What causes the difference in water levels
• What do we call the accumulated water behind a hydroelectric dam?

  Reservoir
• What causes the tides that tidal barrages utilize?

  The moon's gravity
• How often do high tides occur?

  Twice each day
• Where are tidal barrages typically placed?

  In estuaries where rivers meet the ocean
• What type of energy is converted into electricity in hydroelectric systems?

  Gravitational potential energy
• What happens to the water after it passes through the turbines in a dam?

  It flows back into the river
• Why are hydroelectric dams considered reliable sources of electricity?

  They can respond immediately to demand
• What are the pros and cons of hydroelectric dams and tidal barrages?

  Pros:

  • Generate large amounts of energy
  • No pollution
  • Reliable electricity sources
  • Low running costs
  • Scalable for different sizes

  
  

  Cons:

  • Significant environmental impact
  • Flooding of large areas
  • Disruption to fish migrations
  • High initial setup costs
• What is a major environmental downside of hydroelectric dams?

  They often flood large areas
• How do hydroelectric dams and tidal barrages affect fish migrations?

  They can block fish from traveling
• What is a common issue with the initial setup of hydroelectric dams and tidal barrages?

  It is often expensive