Here’s the need-to-know stuff about the energy source, tidal power!
Description
As the Moon orbits the Earth, its gravity exerts a pulling force on the Earth. Tides are the rising and falling of the world’s oceans caused by this pulling force.
Where can you find tidal power?
Tidal energy can be harnessed wherever there is a strong tidal current. The best locations in the UK are in Scotland and the Severn Estuary. But there are only a few commercial tidal energy plants around the world.
How is it made into electricity?
Tidal energy can be harnessed in two ways. Tidal barrages block an estuary, to force the tidal current through turbines that generate electricity. Tidal Stream generation uses large turbines attached to the seabed. Rather like those used in a wind farm, these have large blades that are made to rotate by the tidal current. This turns a generator to produce electricity.
What are the advantages of using tidal power?
- It is a renewable source of energy, which means that it will not run out.
- As an island we have several suitable sites where there is a strong tidal current.
- The energy source is free once the device is built and installed.
- No fuel is needed and no waste or emissions are produced.
What are the disadvantages of using coal?
- Tidal stream power is still under development – it could be 10 years before it is ready to be used on a large scale
- Tidal stream power is more expensive to install and maintain than other forms of electricity production.
- Tidal barrages are extremely expensive and can harm the estuary environment.
- Both barrages and tidal stream plants can cause problems for shipping.
📖 Words to know
- Tide
- The daily rise and fall of the sea, caused by the Moon pulling on the oceans.
- Renewable
- An energy source that can be used again and will not run out.
- Turbine
- A device that uses moving water or air to spin a rotator and make electric power.
- Generator
- A device that turns movement, like spinning steam-driven blades, into electricity.
⚠️ Watch out!
🎧 Listen and watch
- Facts about water power! — Curious Kate on what moving water can do.
- Grid for Good: Energy Dilemmas — how countries choose between different ways of making power.
How much do you know about tidal power?
What causes the tides?
- The Moon pulling on the oceans
- The wind
- Boats
- Earthquakes
Why is tidal power easier to plan for than wind power?
- We know exactly when the tides will happen
- It is cheaper
- It works indoors
- It needs no machines
What is a tidal barrage?
- A barrier across an estuary with turbines in it
- A boat that makes electricity
- A kind of solar panel
- A very large battery
We’ve got a whole series about energy, electricity, and power generation! It’s called Curious Kate, and you can listen to it below!
Add a comment