What is Hydro Power?
Using moving water to
What are some examples of
“moving water” that is used
to generate electricity?
Flowing water in streams and rivers
Water falling over waterfall or dams
The ocean’s tides (tidal power)
What does the word “hydro”
When we use the water moving
through a dam to create
electricity, we call this ____.
How does a hydroelectric plant work?
The moving water turns wheels that run
turbines that, in turn, run generators that
What are some ADVANTAGES
(good things) of hydroelectric
+ Once a dam & power plant is
built the electricity is inexpensive
+ Does not cause pollution
What are some (not so good
things) DISADVANTAGES of
1. Dams may have negative effects
on the environment
2. The interrupt the migration of
What is Tidal Power ?
Using the movement of ocean water
(the ebb and flow of currents) to
Animation of tidal
Illustration of how
tidal power works.
The blades turn as
the tide goes in our
The blades turn
turbines that turn
Advantages of Tidal Power
+ large source of potential energy
+ Does not generate waste or pollution
+ Water is abundant (there is lots of it)
+ There will always be tides so we will
always have this type of power.
+ May protect coastline against damage
from high storm tides and provide a
ready-made road bridge
Disadvantages of Tidal Power.
- Only a few coastal areas are suitable
- A dam across a bay blocks boats & fish
from traveling up river
- Expensive to build
What causes tides?
Tides and tidal currents are generated by
gravitational forces of the sun and moon
on the earth's waters. Due to its proximity
to the earth, the moon exerts roughly
twice the tide raising force of the sun.
So where does tidal power get its
energy from? In other words, what is
If tides are generated by gravitational
forces of the sun and moon on the earth's
waters. Then…. The sun and moon is
where the energy or power comes from.
Neat Websites to look at: