Introduction
Introduction
- The energy generated from sunlight is considered a renewable energy that is not expected to run out, and is therefore considered one of the most important promising sources that humans can benefit from in a very large way in generating electricity that cannot be dispensed with in many areas such as various industries as well as modern means of transportation that require electricity to operate and even in aspects of human life such as lighting and operating various household appliances that help humans in their daily lives.
- Solar energy is also considered a clean energy that does not contribute to environmental pollution, unlike other energy sources such as coke and biodiesel. These sources, in addition to causing environmental pollution as a result of the emission of carbon dioxide, are non-renewable sources, meaning that they will run out over time.
* How to generate electricity from solar energy.
- Electricity is generated from the energy generated from sunlight through what is called solar cells.
* What are solar cells.
- Solar cells are panels of silicon and semiconductors.
* The mechanism of action of solar cells in absorbing solar energy and converting it into electricity.
- Solar cells depend in their work on the process of blocking and absorbing sunlight through an anti-reflective material such as silicon in preparation for transferring these rays to the layers specialized in converting them into electrical energy, and these layers consist of semiconductors.
- In other words, when sunlight falls on the cell, the inactive electrons on the surface of the cell are excited and stimulated, so the movement of the electrons increases and then they are collected by the layers of the cell made of semiconductors in order to generate the voltage difference required to generate electricity.
* Types of solar energy.
- There are two types:
The first type: photovoltaic energy.
This energy depends on simple panels of solar cells according to their uses, including.
A picture of a solar cell placed on top of a lighting pole because the cell absorbs the sun's rays and converts them into electricity to light the pole at night
Simple solar cells to generate electricity used in street lighting
Where the cell is placed on the lighting pole to absorb the sun's rays
During the day and is stored in a specific way to be used in lighting at night.
- Photovoltaic energy can also be used by placing simple solar cells
on the roofs of houses to benefit from the electricity generated from them in operating
multiple household appliances as well as for heating, especially for homes located in remote areas.
The second type: concentrated solar energy.
- Where electrical energy is generated on a larger scale by installing a very large number of
Solar cells facing the sun directly and over a large area estimated at thousands of meters and the energy generated from these cells is connected to the main grid of the country where the use is at the level of the country as a whole.
* Tips for maintaining solar cells so that they can be used effectively and permanently.
- Continuously clean the cells from any dust or debris that may accumulate on them over time so that they are always fit for use.
- Avoid placing the cells in places with tall trees or any shadows so that they do not block the sun, which is the basis for generating electricity.
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