We know that energy is the ability of an object to do some sort of work. energy exists and different forms like kinetic energy and potential energy. let’s take a look at solar energy. as the world solar means the sun. solar energy means the energy of the sun. every day the earth receives a huge amount of energy directly from the sun. using special scientific methods, we can utilize this solar energy.
That means, we can convert solar power and other useful forms of energy. for example, we can convert solar energy into electrical energy. and then we can convert electrical energy and to heat energy, kinetic energy, potential energy, etc.
Solar energy is a cheap source of energy that can be easily converted into other useful forms of energy. do you know how solar power reaches the earth and how much solar power reaches the Earth? as we know that light travels in the form of waves, solar energy reaches the earth in the form of sunlight. one-meter square area of the atmosphere deceives 1.4-kilowatt-hour energy. which is also known as a solar constant. it means the solar power absorption of our atmosphere is 1.4 kilowatts per meter square (1.4kWh/m2).
Now passing through the atmosphere, the total solar energy is reduced due to the following reason. as we know the atmosphere is a collection of different gases. hence, the solar power is absorbed by the gas particles, water vapors, dust particles, and reflection. on a clear day, it’s known the intensity of solar power reaching the earth is about one kilowatt per meter square (1kWh/m2).
Hence this energy can be converted are used to heat water are produce electrical energy. for example, we can convert solar energy into electrical energy through the use of semiconductor devices like silicon. and these are called solar cells.
Solar cells are also known as photovoltaic cells. solar cells are made up of silicon. electrons and the silicon gained energy from the sunlight to create a voltage. a single voltage our solar cell produces a very small amount of voltage. to get sufficient high voltage for practical use, a large number of such solar cells are connected in series forming a solar panel.
For cloudy days and nights, electric energy can be stored during the sunlight, via nickel-cadmium batteries. by connecting them to solar panels, these batteries can then provide power to electrical appliances ignite are on cloudy days.
All the solar cells are expensive. but it lasts for a long time and has a low running cost.
How does solar energy make electricity?
The earth gets more energy from the sun in one day. then the whole world’s population uses in an entire year. every living thing depends on the sun for its existence. from tiny microbes deep in the ocean to plants animals and people.
Humans have been tinkering with solar energy since the dawn of time ancient civilizations used glass and mirrors to light fires. but it wasn’t until the 1950s that technology was developed to convert the sun’s energy into electricity using photovoltaic cells. today solar technology is more efficient and less expensive. and is used all around the globe to create electricity heat water cook food and even power vehicles. so how do solar panels usually work?
When the sun hits a solar panel, the material inside (usually silicon) absorbs the energy and this causes the electrons and their atoms to get very excited and start moving around. the atoms then get hot and shed the electrons. which travel out of the panel through copper wiring and output the electricity.
A control device called an inverter changes this electricity from direct current (DC) to the alternating current (AC) we use. the electricity then passes from breaker boxes to outlets, and into electrical items like your computer, tv, and lights. whatever you don’t use can go back into the grid to be used by someone else.
So, there you have it. the amazing power of the sun. some people see a future where most of our energy can come from this pollution-free and renewable resource. that’s a sunny outlook that will make the whole world smile.
Applications of solar energy
Let’s study some applications of solar energy. solar cells are used to power satellites having large solar panels that keep facing the sun. solar watches and solar calculators are also used nowadays. solar power is used in industrial zones for power generations. solar energy provides electrical energy to tube wells.
Nowadays different developed countries have introduced cars that are completely running on solar energy. remember that solar energy is renewable energy. which we can use again and again. solar power is an environment-friendly source of energy. it means solar power doesn’t pollute our environment because it doesn’t produce pollutant gas like carbon dioxide, sulfur dioxide, etc.
To summarize this post. we learn that solar energy is the power of the sun which we can use in different ways for a long period without environmental hazards. that is why developed countries like China has invested billion dollars in renewable sources of energy.
Resources to learn more: Renewable energy – Wikipedia