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Tidal power

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Content objective:

What are we learning? Why are we learning this?

content, procedures, skills

Vocabulary objective

Tier II: High frequency words used across content areas. Key to understanding directions, understanding relationships, and for making inferences.

Tier III: Low frequency, domain specific terms

Building on what we already know

What vocabulary & concepts were learned in earlier grades?
Make connections to prior lessons from this year.
This is where we start building from.

Ocean tides are caused by tidal forces.

What are “tides”?

Types of tidal power

Tidal barrages -most efficient.

A dam that utilizes the potential energy generated by the change in height between high and low tides. This energy turns a turbine or compresses air, which generates electricity.

Tidal power generation

image from technologystudent.com/images5/tidal1.gif

Tidal fences – turbines that operate like giant turnstiles

mechanical energy of tidal currents used to turn turbines. These are connected to a generator that produces electricity

tidal fences GIF

Tidal turbines – similar to wind turbines but these are under water.

mechanical energy of tidal currents used to turn turbines. These are connected to a generator that produces electricity

tidal turbines

Many other designs are possible, for instance:

Fluid Pumping Apparatuses Powered By Waves Or Flowing Currents

 

Great animations

We have identified six main types of Tidal Energy Convertors (TEC):

 

Advantages of tidal power

Environmentally friendly

Relatively small amount of space

Ocean currents generate relatively more energy than air currents because ocean water is 832 times more dense than air and therefore applies greater force on the turbines.

Disadvantages of tidal power

high construction costs

Amount of energy is not constant per hour, or even per week

requires a suitable site, where tidal streams are consistently strong.

Must be capable of withstanding strong tides and storms, and can be expensive to maintain and repair

Related topics

Why Is There a Tidal Bulge Opposite the Moon?

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