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# Solar cells

Extracts from this document...

Introduction

Solar cells Coursework Aim I am trying to find out the relationship between light intensity and current produced by a solar cell and to explain how this happens. Background Research Solar cells need a sustainable amount of electricity to function properly. Solar cells transfer light energy into electrical energy. Although they involve no moving parts, they are high-tech solid-state devices. They are constructed by layered special materials called semi conducts; these are linked by electrical wires and arranged on a panel of glass (module). The panel will give out more energy depending light intensity it is getting. Light energy contains photons witch hit the solar panel and bump electrically charged particles around in the cell they then cause the electrons to move around and complete the circuit. This process repeats itself to give out energy. Prediction I think that when the light is moved further away than the solar cell the current will reduce because a solar cell needs light to create its current therefore without light it would not work. ...read more.

Middle

because they are closer to each other I may get more precise results Brightness of light source Will increase range of results I will measure this using an ammetre and measuring the current produced by the solar cell Preliminary Method I will firstly set up my experiment. Then I will turn on the power to get my light source to work. I will then place the solar cell at the following different measurements firstly 10cm away from the light source then 20cm, 30cm, 40cm, 50cm, 60cm, 70cm, 80cm, 90cm, 100cm. I will be measuring the current at each of these different measurements to find the relationship between light intensity and the current produced. Preliminary results CM (MA) 10 3.8 20 .2 30 .1 40 .97 50 0 60 0 70 0 80 0 90 0 100 0 Improvements to Method In my preliminary experiment I had a dim bulb so I did not get very good readings therefore I will use a brighter bulb in my main experiment. ...read more.

Conclusion

1.6 1.8 1.7 40 1.4 1.4 1.6 1.5 50 1.2 1.2 1.2 1.2 60 1 1 1 1 70 0 0 0 0 80 0 0 0 0 90 0 0 0 0 100 0 0 0 0 Conclusion I have met the aim of the investigation. My conclusion does support my original prediction because, I predicted that if it is moved 4 times closer the solar cell will be 4 times stronger. This is because more light = a bigger current therefore the closer the so the the light source the stronger the current was. Evaluation My results were very good and quite close although I did end up with a few anomalous results but I think they were caused due to experimental error. I was quite accurate although I could of changed the measurement and maybe of got clearer results. Overall, my results were good and I got an understanding of how Solar Cells work. ?? ?? ?? ?? Name: Gabraella Howard Tutor Group:11 IN/CY Science Teacher: Mr.Crook Science group: 10D2 ...read more.

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