Hydroelectric 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 is a reservoir in the context of hydroelectric dams?

  A large accumulation of trapped water
• What causes tides that tidal barrages utilize?

  The moon's gravity affecting sea levels
• 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
• What are the pros and cons of hydroelectric dams and tidal barrages?

  Pros:

  • Generate large amounts of energy
  • No pollution produced
  • Reliable electricity sources
  • Immediate response to demand
  • 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 affect fish migrations?

  They can block fish from traveling
• What is a common characteristic of both hydroelectric dams and tidal barrages regarding energy generation?

  They generate energy with no pollution
• What is a benefit of hydroelectric dams in terms of energy demand?

  They can provide immediate response
• What is a disadvantage of both hydroelectric dams and tidal barrages?

  High initial setup costs