The first day our group got together about our final project it was mainly brainstorming. Since the course is about sustainability we wanted to create a simple yet interesting experiment that high school students would be interested in. When we decided on the compressed air pump Mohammed knew all the science behind creating our project. For our experiment to work correctly we needed certain materials.
We used a bike pump as the means for compressed air. The tubing was purchased at a local hardware store along with the lights and platform everything is set onto. The gears, generator, and acting cylinder were purchased online on Amazon for a reasonable price. One end of the tubing was attached to the bike pump and the other into the acting cylinder. To connect the acting cylinder with the gears we tied floss to the gears and created a pulley system. One end of the floss was attached to the gears and the other the end of the acting cylinder. When the air is released through the tubes it will move the acting cylinder also moving the floss which turns the gears activates the generator and turns on the lights. We had difficulties due to the floss breaking and fixed it by braiding the floss to make it stronger.
For the high schoolers to better understand our experiment we created a slideshow to give background on the topic.
When we were performing the experiment to test our data we set the bike pump at different pressures (psi), measured the voltage of the light, and the time in seconds. First we started with 40 psi which had a voltage of 1.8 and it took 12 seconds for it to complete. As we increased the psi the voltage rose a little more than the last one. By the time we got to 70 psi the voltage was 2.1 and took 6.6 seconds to complete. Also as the psi/voltage increased the time to complete became quicker. The final pressure we did was 80, the voltage had continued the pattern and the final voltage was 2.4 and it took 5.5 seconds to complete.