Tag Archives: Voltage

Brainstorm Session

During our brainstorming session, my group had a lot of different ideas bouncing around of what exactly we wanted our experiment to be on. We thought it would be more helpful to think of an experiment that was simple to do but very effective at making a connection with the energy crisis we are currently experiencing. Initially we wanted to do an experiment that was completely dependent on the Lego Mindstorm Kit. We searched around online and found a few experiments, but they didn’t really have that much emphasis on sustainability and energy. A fun experiment is obviously more enjoyable to the students but if no useful data can be extracted than what was the purpose? We needed an experiment that we could get data out and make students analyze and interpret this data. After asking ourselves these essential questions, we ended up rejecting the Lego Mindstorm Kit ideas because they weren’t fitting our model of what a good experiment should be.

 

We decided to change gears and think of an experiment we have performed in class but alter it to make a different experiment but still keep the fundamental ideas the same. We decided on taking the solar energy experiment and making the obstruction in between the solar panel and the light source materials that are more accurate to those in our environment. We quickly brainstormed what type of things get on solar panels and we ended up with water (from rain) and dirt/dust (which accumulates over time). One of the most brought up obstructions during our group discussions was bird poop, which is very true but implementing it in the experiment was not going to happen for obvious reasons. We all agreed upon this experiment, in which we would measure the voltage output of solar panels with different obstructions. I will further discuss the experiment in my next blog.

Generator Experiment

During our Freshman Seminar class on October 26, we performed a Generator Experiment. Ultimately, we were testing the creditability of Faraday’s Law. Faraday’s Law states that if you change the magnetic flux through a coil it will result in a voltage to be “induced” in the coil. This would result it in a voltage and current to be created. We simulated this statement by having a shaking flashlight. The outer casing of the flashlight is transparent and inside this outer shell there is a copper coil with many turns. Also inside the flashlight is a magnet. The magnet is loose and can move freely vertically. By shaking the flashlight the magnet would move through the coil thus producing a voltage and current. We collected the data (voltage being produced) by using a NXT microcontroller, which was running Labview code. A copy of the code can be seen below:

 

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I have provided a copy of our data points that we collected during each 30-second trial. In each trial we would increase the number of shakes. In addition, a scatterplot is provided displaying the best-fit line and the coefficient of determination (R2).

 

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As can be observed in the graph as the number of shakes increased, the sum of voltage squared increased as well. The faster the magnet crossed through the coil the more electricity that was being produced. At times the voltage reading was negative and this is because the polarity was changing from positive to negative. In conclusion, our R2 value was 0.96 thus concluding that there is a very strong relationship between the number of shakes and sum of voltage squared.