Wave and Tidal Energy

What are tides?

• The cyclic rise and fall of the Earth.

• The cyclic rise and fall of tides.

• The cyclic rise and fall of sea levels.

• Wind energy moving across the surface of the ocean.

Which is more reliable, tidal or wave energy?

• Tidal energy

• Wave energy

Which is a disadvantage of wave energy?

• It doesn't create pollution

• It is renewable

• It is not renewable

• It is only suitable to certain locations

What are the three main tidal technologies?

• Tidal barrages, tidal power and tidal turbines

• Tidal barrages, tidal fences and tidal turbines

• Tidal fences, tidal power and tidal electricity

• Tidal power, tidal turbines and tidal barrages

How do tidal barrages work?

• A dam traps water on one side when the tide is high. The gravitational potential energy gets converted into kinetic energy, which spins the blades, and a generator turns it into electricity.

• A dam allows the water to pass through turbines quickly, and the chemical energy that is turning the turbines gets transferred into heat energy with the help of generators.

• The blades of turbines spin due to the flowing water, and this gets converted into kinetic energy with the help of a generator.

• A dam prevents water from passing through, and this results in the chemical energy that is formed through the movement of water against the dam to be converted to kinetic energy.

For tidal barrages to produce electricity, what should the difference in water level be?

• 5m

• 4m

• 4km

• 5km

What is the difference between wave and tidal energy?

• Wave energy is based on the gravitational pull of the moon, while tidal energy is derived from wind blowing against the surface of the ocean.

• Wave energy is energy that we get from the strength of wind, while tidal energy is based on the amount of water in estuaries.

• Wave energy is the energy derived from wind blowing against the surface of the ocean, while tidal energy is based on the gravitational pull of the moon.

• Wave energy is energy derived from sunlight and moonlight, while tidal energy is energy that we get from the surface of the ocean.

Tidal fences disrupt marine wildlife.

• True

• False

The production of wave energy results in CO2 emissions.

• True

• False

Why do we say that wave and tidal energy is renewable?

• It does not affect the environment.

• We use it on a daily basis.

• It easily runs out and cannot be replenished.

• It does not run out and is naturally replenished.