Equipment:

• One generator (magnet that moves back and forth
  inside a coil of wire)
• One voltage probe
• One NXT adaptor
• NXT
• Labview VI  generator_lab.vi
• Excel sheet

FARADAY’S LAW
Faraday’s Law states that changing magnetic fluxes through coiled wires generate electricity (currents and voltage).   The greater is the change in magnetic flux, the greater are the currents and voltages. In this lab we had to shake a tube which has a magnet that will travel back and forth through a coil of wires. We was able to show that the faster you shake the tube, the greater will be the generated voltage.

We experimented with generators this week, and found ways to generate electricity using flashlights. Each flashlight had a magnet inside it that could be moved up and down with a simple shake of the wrist. The simple movement caused a change in the magnetic field. The bigger the change, the bigger the increase in energy.

We connected the flashlight with a voltage probe and NXT adapter. After that we shook the flashlight in 30 second intervals. The first time we shook it at slow pace, and then increased the speed each time for a total of five sessions. The computer collected the data.

The we had to calculate in Excel the sum of the squares of the
generated voltages (SSGV’s) (the voltage is logged after each second)..

Next, we plot the SSGV’s as a function of # of shakes and
fit the result to a linear curve graph..