The sunis the ultimate source of loads of energy.
The Sun's light can be used in photocell and solar heating. You can capture the sun's energy using photocells.
1)Photocells (solar cells) generate electricity directly from sunlight.
2)They gernerate a DC (Direct Current)
3)Photcells are usually made from silicon - a semiconductore. When the sunlight falls on the cell:
i) the silicon atoms absorb the energy, knocking loose some of the electrons,
ii)these electrons then flow round the circouit - this is electricity
4)The current and power output of a photocell depend on:
i)its surface area ii)the intensity of the light iii)the distance from the light source
Advantages - Sturdy, Long lasting, Low maintenance, no power cables or fuel doesn't pollute where the solar panel is
Disadvantages - No sunlight = No power
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