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# The Resistance of Play-Doh

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## Claudia Rohr

on 1 June 2015

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#### Transcript of The Resistance of Play-Doh

Analysis
Procedure
Data
Conclusion
Play-Doh does indeed conduct electricity and provide resistance. The amount of resistance depends on the length and thickness of the "wire." The Play-Doh with a large diameter and a short length provided the greatest resistance at 56.41 V/A. The Play-Doh that provided the second greatest resistance, of 41.68 V/A, had a small diameter and a long length. The other two Play-Doh "wires" provided similar resistance around 15 V/A. A source of error in our experiment was that the meters, especially the Ammeter, only read out to one decimal place, making our data points and linear fits less accurate.
Gather indicated materials and set up as seen in the diagram
Using a ruler measure out 4 Play-Doh rolls.
One 7cm long 1.5 cm in diameter
one 7cm long 1 cm in diameter
one 5 cm long 1.5 cm in diameter
one 5 cm long 1 cm in diameter
stick wires in either end of the Play-Doh roll and connect each wire to the voltmeter.
Connect one wire to the ammeter, and the other wire back to the power source with an alligator clip
Increase and decrease the voltage 8 times, noting the voltage and current each time
Repeat for each Play-Doh roll
Graph Electrical Potential Difference vs. Current using logger pro
Purpose
The purpose of this experiment is to determine the resistance in a piece of Play-Doh by placing pieces different lengths and diameters in a circuit.
The Resistance of Play-Doh
By Kayla Jischke & Claudia Rohr
Voltmeter
Play-Doh
Materials
Ammeter
Laptop

Play-Doh Dimensions:
Diameter: 1.5 cm
Length: 5 cm
Electrical Potential Difference, ΔV, (J/s)

Current, I (c/s)
Logger Pro
17.65
16.69
15.17
12.25
13.57
13.10
10.87
9.49
.1
.1
.1
0
0
0
0
0
Play-Doh Dimensions:
Diameter: 1.5 cm
Length: 7 cm
Electrical Potential Difference, ΔV, (J/s)

Current, I, (c/s)
19.47
19.03
17.75
1.75
15.87
15.26
10.58
8.97
.2
.1
.1
0
0
0
0
0
Electrical Potential Difference, ΔV, (J/s)

Current, I (c/s)
Play-Doh Dimensions:
Diameter: 1 cm
Length: 5 cm
18.1
17.90
17.07
15.4
14.86
13.78
12.68
13.41
.1
.1
0
0
0
0
0
0
Electrical Potential Difference, ΔV, (J/s)

Current, I, (c/s)
Play-Doh Dimensions:
Diameter: 1 cm
Length: 7 cm
17.4
16.01
14.4
132
12.77
10.22
8.86
7.72
.2
.2
.15
.1
.1
.1
.1
.1
Wire
Alligator Clips
Power Source
Ruler
A
B
C
D
EOL's:
Long and Skinny: I=41.68(V/A)ΔV
Long and Fat: I=13.9(V/A)ΔV
The Graph of Electrical Potential Difference vs Current yields the units volts per amp, or the change in potential required for a current of 1 amp thru the Play-Doh. The slope is represents resistance, or opposition to a flow of charge. The slope is not a universal constant, but is a constant for a given piece of Play-Doh. The longer the Play-Doh, the slope increased, and therefore the resistance. It is also seen that the thinner the Play-Doh, the greater the resistance.
Diagram
Power Source
Ammeter and Voltmeter
Alligator Clips
Play-Doh
Short and Fat: I=56.41(V/A)ΔV
Short and Skinny: I=15.06(V/A)ΔV
Full transcript