Energy from the sun
- Created by: Maza2999
- Created on: 04-03-14 12:58
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- Energy from the sun
- Photocells
- DC
- Advantages
- Little Maintenance
- No cables
- Do not need to connect to the National Grid
- No fuel is needed
- Long life
- Disadvantages
- They do not work at night or in bad weather
- Expensive
- How they work
- P-type and S-type Silicon
- Negatively charged electrons are knocked loose when light energy is absorbed
- The electrons flow freely, creating an electrical current
- Solar Heating
- Passive Solar Heating
- Light passes through glass windows and is absorbed by different surfaces
- The heated surface emits infrared radiation
- The wavelength is longer so can't pass through the glass again
- The glass reflects the radiation, warming up the room
- The wavelength is longer so can't pass through the glass again
- The heated surface emits infrared radiation
- Light passes through glass windows and is absorbed by different surfaces
- Passive Solar Heating
- Solar Collectors
- Use mirrors to focus the suns rays onto a small area
- Water from a tank runs through small pipes on the roof to be heated by the concentrated light
- The heated water goes back to the tank where it should stay warm
- Photocells
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