Solar panels catch sunlight and turn it into electric current. Each panel has many solar cells. The cells are made of silicon. When sunlight hits the silicon, it knocks electrons loose. The loose electrons move through the cell. This moving flow is called electric current. One cell makes only a small current. But many cells together can make enough current to power a house. Solar panels are a clean way to make electricity. They do not use fuel and do not create pollution. They are becoming more popular around the world.
People put them on rooftops or in fields where they get lots of sun. Australia has many sunny days, so solar power works well there. Inside a solar cell, the silicon is treated to have two layers. One layer has extra electrons. The other layer has space for electrons. The boundary between them creates an electric field. When light hits the cell, it gives energy to an electron. The electron jumps across the field. The field pushes the electron to the top layer. This movement is the current. Each photon of light can free one electron.
More light means more current. That is why solar panels work best in direct sunlight. The electric field is very important. Without it, the electrons would not flow. This process is called the photovoltaic effect. The electrons flow from the top layer into metal contacts on the cell. The contacts are like thin wires. They collect the electrons and send them into larger wires. The flow of electrons is called direct current, or DC. Batteries also produce DC. But most homes and appliances use alternating current, or AC. So the DC must be changed to AC.
People put them on rooftops or in fields where they get lots of sun.
A device called an inverter does this job. The inverter is usually placed outside the house. It connects all the panels and converts the electricity. After conversion, the AC can be used in your home. After the inverter changes DC to AC, the electricity goes to the house. It powers lights, fridges, and other devices. If the panels make more power than the house uses, the extra goes to the electricity grid. The grid is the network of power lines. In Australia, people with solar panels get credits for sending extra power to the grid.
This is called net metering. It makes solar power more affordable. Some homes also have batteries to store extra power. Batteries let people use solar power at night. They are becoming cheaper and more efficient. Batteries help make solar energy available even when the sun is not shining. Solar batteries work like big rechargeable batteries. During the day, they charge from extra solar power. At night, they provide electricity to the house. This means the house can run on solar power all the time. Modern batteries can power a home for many hours.
They also help the electricity grid by storing energy when it is not needed and releasing it when it is. Many Australian families choose to add batteries to their solar systems. This reduces their electricity bills and helps the environment. Battery technology is improving quickly. Prices are going down. In the future, more homes will have solar and batteries. Solar energy is clean because it produces no pollution. It does not release greenhouse gases. Burning coal and gas does release these gases, which harm the planet. Using solar panels helps Australia reduce its impact on the environment.
The sun gives more energy than we can ever use. As solar technology gets better, panels become more efficient and cheaper. Governments and companies are building large solar farms. These supply electricity to many homes. Solar panels also power things in remote places, like water pumps and street lights. Solar energy will play a big role in our future energy needs.