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 natural phenomenon do tidal barrages utilize to generate power?

  The cyclic rise and fall of sea levels
• What causes high tides in the ocean?

  The effect of the moon's gravity
• Where are tidal barrages typically placed?

  In estuaries where rivers meet the ocean
• What type of energy is converted into electricity by the water released from the reservoirs?

  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
  • Reliable electricity sources
  • Low running costs
  • Scalable for different sizes

  
  

  Cons:

  • Significant environmental impact
  • Flooding of habitats and villages
  • Disruption of 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 stop fish from traveling up or down
• What is a benefit of hydroelectric dams in terms of electricity demand?

  They can provide immediate response
• What is a common feature of both hydroelectric dams and tidal barrages regarding energy generation?

  They generate energy with no pollution
• What is the main advantage of the running costs for hydroelectric dams and tidal barrages?

  They are fairly low
• What is the initial setup cost situation for hydroelectric dams and tidal barrages?

  It is often expensive