Watch videos with subtitles in your language, upload your videos, create your own subtitles! Click here to learn more on "how to Dotsub"

Solar energy

0 (0 Likes / 0 Dislikes)
The sun is the original source of almost all the energy used on Earth. The Earth receives a staggering amount of energy from the sun. As much energy falls on the planet each hour as the total human population uses in a whole year. Solar panels are made from photovoltaic cells or PV for short. Simply broken-down "photo" means light and "voltaic" relates to the production of electricity. Photovoltaic technology enables the creation of electricity using light. PV cells have at least two layers of semiconductors. one is positively charged and one is negatively charged. When the light shines on the semiconductor the electric field across the junction between these two layers causes electricity to flow. The greater the intensity of light, the greater the flow of electricity. There are many sorts of PV panels, including PV tiles, which replace normal tiles and simplify the install. They can be installed onto a domestic house easily and work very simply. Any surface in roofs is suitable. The light that heats the panels is converted into clean electricity. There are no moving parts, so this is a silent operation. The electricity generated by the panels is direct current. By installing an inverter is converted to alternating current so it's in sync with the main electricity and can be used normally. The clean electricity is fed into the main by the fuse board. Using meters the amount of electricity generated and used can be recorded and any spare electricity is back by the electricity supplier. The amount of energy available from the sun differs depending on your location. For example, Edinburgh receives eight hundred (800) kilowatt-hours per square meter. In London is one thousand (1000) and Madrid one thousand five hundred (1500). Although the UK is considered to have a wet and cloudy climate eight hundred (800) kilowatt-hours per square meter is enough energy to power an energy efficient home. You will just need ten square meters of PV to provide enough electricity to power such a home entirely from solar energy. Solar photovoltaics are a simple and practical way of powering buildings with clean energy. We believe a sustainable future is within our reach in this generation.

Video Details

Duration: 2 minutes and 32 seconds
Country: Spain
Language: English
Genre: None
Views: 171
Posted by: ang_ruiz on Dec 9, 2011

Today, solar energy is used industrially to produce heat and electricity.

Caption and Translate

    Sign In/Register for Dotsub to translate this video.