Collecting Energy from the Sun - Photocells
- The sun is a stable source of energy that transfers energy to Earth as light and heat which can be captured and used to produce electricity. Renewable (doesnt run out)
Photocells *They capture light energy from sun on flat silicon surfaces which is then transformed into an electric current that travels in the same direction at all times, called a Direct Current (DC). *Power output of a photocell depends on the surface area exposed to sunlight, lots of photocells join together as a solar panel to increase surface area, increasing amount of light captured.
Advantages - use renewable energy, no fuel, no pollution, no waste, long life, little maintenance. Disadvantages - no power at night or during bad weather, expensive to buy, take up space.
The power output depends on: *the surface area exposed to light *the intensity of a light *the distance between the light source (sun) and the photocell