GREEN POWERED GRAVITY LIGHT Stella Matutina Girls High
- Slides: 30
GREEN POWERED GRAVITY LIGHT Stella Matutina Girl’s High School Yi-Hsuan Chen, Yann-Tsyr Tuan, Zi-Yun, Lai
Table of Contents Introduction Gravity Light Discussion
Introduction
Literature Review— Ready-made Gravity Light Gravity light, invented in 2012 by Jim Reeves and Martin Reddiford, is a lighting equipment that can shine by Potential Energy. It provides light without electricity and benefits poor countries.
Literature Review— Ready-made Gravity Light How does it work?
Literature Review— Home-made Gravity Light
Literature Review— Celling Fan Wind Turbine
Research Purpose DIY gravity light with recycled materials. ▲ the motor of a broken celling fan ▲the wheel of a broken bike
Results—Video
Gravity Light
Design axles (wheels) Try hand Try different made weight from wheels and axis generator, 7~12 kg to axis of (bamboo) modified test its different LED stand fan average diameter. motor and voltage and modified falling time. ceiling fan generator motor to get (ceiling fan the one motor) which has the highest weight
Materials—Generator 1 CD LED Coil Pipe Powerful Magnets ▲ hand made generator
Materials—Generator 2 ▲ the motor of stand fan
Materials—Generator 3 ▲ the motor of ceiling fan
Method—Making Generator 3 Take out this
Method—Making Generator 3 N S Stick the magnets N
Method—Making Generator 3 Seal the outer
Results
Results
Data—Weight & Average Voltage R 2 = 0. 9989 40 35 30 Volt(V) 25 20 15 10 5 0 0 5 10 Weight(kg) When the weight increases 1 kilogram, the average voltage will increase 5 volts meantime. 15
Data—Weight & Falling Time 450 400 350 300 250 Time(s) 200 150 100 50 0 0 2 4 6 8 Weight(Kg) 10 The falling time decreases as the weight increases. 12 14
Data —Kinetic Energy Transferring Efficiency Friction Heat
Data —Kinetic Energy Transferring KETE Efficiency Kinetic Energy Transferring Efficiency ＝ Original Ek- Final Ek Original Ek ＝ Electric Energy Original Ek ＝Kinetic of the weight without electrical load Final Ek ＝Kinetic of the weight with electrical load
Data —Kinetic Energy Transferring Efficiency(KETE) 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0 2 4 6 8 10 Weight(kg) When over 11 kilograms, the kinetic energy transferring efficiency will maintain at 77%. 12 14 16
Discussion
Conclusion Although our gravity light’s generating efficiency cannot compare with the ready-made ones, it is proved that recycled materials can be utilized in real life.
Conclusion When under 11 kilograms, the heavier the weight is, the shorter time the LEDs shines, and the more efficient the gravity light is. When the weight is 8 kg, our gravity light is in the best condition. It can fall for 213. 9 seconds and produce 12 volts.
Future Expansion Hang our Gravity Light on the wall to: shrink its volume create longer time for the LEDs to illuminate
Future Expansion Add battery in the circuit to: hang heavier weight to improve the generating efficiency make the LEDs’ brighter.
Q&A
