1 / 7

No QOTD 9/26/14

No QOTD 9/26/14. You have 5 minutes to study for the quiz. Quiz time!. You have about 10-15 minutes for the quiz. When you are finished with the quiz, pick up today’s assignment: Percent Error Calculations.

cadman-buck
Download Presentation

No QOTD 9/26/14

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. No QOTD 9/26/14 You have 5 minutes to study for the quiz.

  2. Quiz time! • You have about 10-15 minutes for the quiz. • When you are finished with the quiz, pick up today’s assignment: Percent Error Calculations. • Make the necessary measurements in the back of the room. I will give you MY measurements later. • When everyone is done, we will take a few short notes on the Percent Error Calculations sheet.

  3. Learning Target • Understand what percent error measures and how it applies to your measurements in the lab. • Be able to calculate percent error

  4. Notes • % error definition: a measure of how inaccurate a measurement is, compared to how large the measurement is. • A measurement that is off by 5 g might be a HUGE error if the true answer was supposed to be 10 g (you would have a 50% error) but the same error of 5 g would be insignificant if the true answer was supposed to be 10 kg. Then you would have only a 0.1% error (meaning 5 g is insignificant when compared to 5 kg)

  5. notes • Formula: Experimental - Theoretical X 100 • Theoretical • Experimental = Values obtained from YOUR measurements • Theoretical = Values obtained from some authority -> book, table, Mr. C, etc. • (+) A positive percent error indicates your experimental values are greater than the theoretical values. • (-) A negative percent error indicates your experimental values are less than the theoretical values.

  6. Sample calculation • Experimental Value: 1.24 g • Theoretical Value: 1.30 g % error = 1.24 g - 1.30 g x 100 = 1.30 g now try calculating it yourself….. - 4.6%

  7. Homework • Finish the measurements • When you have the measurements, come see me for the “theoretical” answers I measured. • Calculate the percent error for each measurement. • Answer the HW problems on the last page

More Related