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Lesson: Tidal Power

Sample Question Videos

Worksheet • 5 Questions • 1 Video

Q1:

Water is allowed to pass through a tidal barrage until the tide is at its highest. The barrage is then closed, and the tide beyond the barrage lowers, while the water behind it stays at the same height. The water behind the barrage is then allowed to flow back through the turbines into the sea.

If the mass of the extra water held back by the barrage is 2 . 4 × 1 0 1 0 kg, and it has an average height of 1.5 m above the water in the sea beyond the barrage, what is the gravitational potential energy of the water held back by the barrage? Use a value of 9.8 m/s2 for the acceleration due to gravity.

Q2:

A proposed tidal barrage power station has an expected maximum power output of 950 MW. If the tidal barrage has 38 turbines, what is the maximum power output of each turbine?

Q3:

What type of electric current do the turbines in a tidal barrage produce?

  • AAlternating current
  • BRectified alternating current
  • CPulsating current
  • DDirect current

Q4:

Which of the following statements correctly describe the disadvantages of building a tidal barrage?

  1. Tidal barrages can alter the habitat of wetland wildlife.
  2. Tidal barrages have very high maintenance costs.
  3. There are only a few locations where tidal barrages can be built. Only some river estuaries are suitable for tidal barrages.
  4. Once built, tidal barrages release large quantities of methane into the atmosphere.
  5. Once built, tidal barrages release large quantities of carbon dioxide into the atmosphere.
  6. Tidal barrages can only generate electricity at certain times of the day. Tidal barrages can only generate electricity following the peak of a high or low tide; they can not adjust to changes in demand.
  • Aa, c, f
  • Ba, e, f
  • Cd, e, f
  • Da, b, c
  • Ea, b, d

Q5:

Which of the following statements correctly describe the advantages of building a tidal barrage?

  1. Once the barrage has been built, no pollutants such as carbon dioxide or methane are released into the environment by electricity production.
  2. Tidal barrages are very cheap to build.
  3. There are no fuel costs.
  4. The maintenance costs for tidal barrages are very high.
  5. Tides are highly predictable; thus a tidal barrage is a reliable source of energy.
  6. Tidal barrages can alter the habitat of wetland wildlife.
  • Aa, c, e
  • Bb, e, f
  • Ca, b, c
  • Db, d, e
  • Ed, e, f
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