Thursday, May 13, 2010
Sound
Sound is the energy produced when objects vibrate.
Sound...
- helps us communicate
- allows us to enjoy music
- use as a warning
Why do you think that glass can produce such a beautiful melody?
By touching the glass, we are making it vibrate, thus, sound is produced.
Generation of electricity
In a fuel power station what happens?
1. A fuel such as coal, oil or natural gas is burnt and heat is produced to boil the water in the boiler.
Chemical potential energy of the fuel-->Heat energy of the water
2. The heat energy turns water into steam at high pressure, which goes through the boiler and turns the turbines.
Potential energy and kinetic energy of steam-->kinetic energy of the turbines
3. The turbines are connected to a generator, which converts the kinetic energy of the turbine blades into electricity
kinetic energy of turbines-->Electricity
Electrical energy
electricity or electrical energy is the energy that results from the flow of charged particles
Electricity is a useful form of energy that can be transformed into many other forms of energy.
Learn more from this video:)
Light energy
Light enables us to see
things that are luminous can give out light energy. The sun is an important source of light energy in the day.
Why are we able to see objects like books even though they don't give off light?
This is because light from a light source, like the sun, reflects light off the and into our eyes.
Why do we feel cool when wearing white on a sunny day but feel hot when we wear black?
Have you ever wondered why roses are red and why violets are blue? This should give you the answers. Enjoy :)
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