Solar panels convert sunlight into electricity through a process known as the photovoltaic effect. Below is a step-by-step explanation of how the energy from the sun ultimately powers something like a lightbulb in a household.
Sun
The process starts with the sun emitting photons, which are particles of light. These photons travel approximately 93 million miles from the sun to the Earth.
Solar Panels
Once the photons reach the Earth, they strike the surface of the solar panels. These panels are typically made of silicon cells that have special properties, enabling them to absorb the photons.
Photovoltaic Effect
When photons are absorbed by the silicon cells, they transfer their energy to the electrons in the atoms of the silicon. With this newfound energy, electrons break free from their atoms and begin to flow through the material. This flow of electrons creates a direct current (DC) of electricity.
Direct Current (DC)
The electrical current generated by the solar panel is in direct current (DC) form. In this type of current, electrons flow in a single, constant direction. While DC is useful for some applications, most household appliances and systems use alternating current (AC).
Inverter
To convert the DC into AC, an inverter is used. The inverter takes the direct current and changes it into alternating current by switching the direction of the flow of electrons at a regular interval. This produces the AC that is compatible with the electrical grid and household appliances.
Alternating Current (AC)
After the conversion, the electricity is now in alternating current (AC) form. This means the electrons are moving back and forth rather than in a single direction. AC is more efficient for transmitting electricity over long distances, which is why it’s used in the electrical grid.
Lightbulb
Finally, this AC can be used to power household devices, such as a lightbulb. When the AC reaches the lightbulb, it powers the filament or LED inside, causing it to emit light.
And there you have it! That’s a simplified explanation of how solar panels work, from the sun emitting photons all the way to a lightbulb lighting up your home.