Solar energy
Every day the Sun radiates, or sends out an enormous amount of energy. It radiates more energy in one second than people have used since time began.
Where does all this energy come from? It comes from within the Sun itself. Solar energy is the most popular energy. How can we use this free energy?
We've used the Sun for drying clothes and food for thousands of years, but only recently have we been able to use it for generating power. It seems that solar energy is everywhere in one way or the other. So, we can say that solar energy is a thing for the future.
The Sun is 150 million kilometers away and amazingly powerful. It is also a useful, cheap and reliable electricity source. Just the tiny fraction of the Sun's energy that hits the Earth is enough to meet all our power needs many times over. Every minute, enough energy arrives at the Earth to meet our demands for a whole year – if only we could use it properly. Due to solarenergy we are able to run technology and various machines like aircraft, car etc. without using fuels.
Advantages of solar energy
· Solar energy is free – it needs no fuel and produces no waste or pollution.
· In sunny countries solar power can be used where there is no easy way to get electricity to a remote place.
· Solar power is renewable. The Sun will keep on shining anyway, so it makes sense to use it.
Disadvantages of solar energy :
· it doesn't work at night;
· it is very expensive to build solar power stations;
· it can be unreliable unless if you live in a very sunny climate.