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Millikan Oil Drop Lab Summary

In this lab, my partner Ryan and I recreated the famous Millikan Oil Drop experiment to find the charge of an electron. The procedure we "followed" is outlined in the Pasco Manual.


We measured the charge for 7 droplets:

  • Droplet 1: C
  • Droplet 3: C
  • Droplet 4: C
  • Droplet 5: C
  • Droplet 6: C
  • Droplet 7: C
  • Droplet 8: C

These charges can be compared to the elementary charge of a single electron (from wikipedia):

e = C

See the Analysis section of the lab notebook for the calculation of the charges of each droplet.


After looking over the manual and other student's experiments I have concluded that Ryan and I did the lab wrong. For more info see the lab notebook. This could be the reason for our unexpectedly large results, or I may have made a mistake in my charge calculation that I simnply cannot find.

Despite having made a large mistake somewhere causing our data to become virtually meaningless, this lab was a good learning experience. In the future I will make sure I've read the manual correctly before starting. My suggestions for improving this lab include getting a brighter lamp for the Millikan apparatus, and finding a way to hook a CCD up to the optics, so you don't have to hunch over watching droplets for extended periods of time.

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