Hydroelectricity & Tidal barrage

• What are the two systems discussed in the video for generating electrical power?

  Hydroelectric dams and tidal barrages
• How do hydroelectric dams and tidal barrages generate electrical power?

  They create a difference in water levels to harness gravitational potential energy
• What is the main difference between a hydroelectric dam and a tidal barrage?

  A hydroelectric dam traps water from upstream, while a tidal barrage uses the rise and fall of tides
• What do we call the accumulated water behind a hydroelectric dam?

  Reservoir
• What causes the cyclic rise and fall of sea levels that tidal barrages utilize?

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

  Twice each day
• Where do tidal barrages typically get placed to generate electricity?

  In estuaries where rivers meet the ocean
• What is the role of the difference in water levels in hydroelectric systems?

  It provides gravitational potential energy to generate electricity
• How does the water flow contribute to electricity generation in dams?

  It spins the blades of turbines connected to generators
• What happens to the water after it passes through the turbines in a dam?

  It flows back into the river on the other side of the dam
• What are the pros and cons of hydroelectric dams and tidal barrages?

  Pros:

  • Generate large amounts of energy with no pollution
  • Reliable sources of electricity
  • Immediate response to increased demand
  • Low running costs
  • Can operate on large and small scales

  
  

  Cons:

  • Significant impact on surrounding environment
  • Flooding of large areas, submerging habitats and villages
  • Can obstruct boat and fish migrations
  • High initial setup costs
• What is a major environmental downside of hydroelectric dams?

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

  They can stop fish from traveling up or down the river
• What is a common issue with the initial setup of hydroelectric dams and tidal barrages?

  It is often expensive