IMPORTANT ANNOUNCEMENTS

RESISTIVITY

Confusion existed in the past regarding the first data table on the data sheet. The data table is called "Resistance Versus Length." At the expense of sounding trivial (or maybe mudding the waters even more), here is an attempt to clear up the confusion.

In general, whenever you see a column with dotted borders (See the picture below. Look at 3rd column) this means that a calulation is required. Whever you see a column with solid borders, this means data should be entered directly as measured.

It is crucial in a laboratory setting to record all data in its most raw form. (The only exception might be to convert the measurement; ie. centimeters --> meters.)

The first data table requires that the student measure the short distance in between each of the screw pairs. These are raw data values.

The second column calls for the length of the wire. The length is a calculation because it is the sum of all the screw pair distances up to that point.

Take the following example:

There is a new version of the data table in Spring 2013.
The new data table gives values for Wire Diameter, rather than wire area.
You will need to calculate the area.
There is also a new row allowing you to record the uncertainty values.
See the Diameter to see where to place these uncertainties.
There is also a movie below dealing with the details for the uncertainties.
Here is the pdf for the new data table.

MOVIES

Please note: If the movie is too small,
And, some videos have much higher quality. Find the HD version using the gear icon.
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Resistivity: Theory

Resistivity: Procedure

Resistivity: Uncertainties

DMM-01- Inputs and Selector for Amprobe 37XR-A Digital Multimeter

DMM-02- Measure Resistance with DMM Amprobe 37XR-A

What about a plot? If you need a semi-quick review, watch this movie.
7.5 minutes will get you enough. The whole movie shows a little more.
If you need a longer movie on spreadsheets and plots,

Resistivity - Quickie Plot

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