This lab is an exciting, fun experiment that connects a new concept with a familiar childhood toy. The playdoh itself has a property independent of its shape called its resistivity, p. . Plug this and your initial temp into your model. Resistivity in Play-Doh: Time and Color Variations Resistivity in Play-Doh: Time and Color Variations Fuse, Christopher; August, Brandon; Cannaday, Ashley; Barker, Casey 2013-09-01 00:00:00 The study of electricity and magnetism is fundamental to all first-year physics courses. 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. This is of course not relevant to the question that was asked.
The longer the Play-Doh, the slope increased, and therefore the resistance. Developing simple electricity laboratory experiences that are open ended and inquiry based can be difficult. 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. For this reason, it may work better to use i. To do this you need an estimate of the heat dissipation coefficient of the playdoh. A graph of Resistance vs.
Any unauthorised copying or posting of materials on other websites is an infringement of our copyright and could result in your account being blocked and legal action being taken against you. Maintain the same diameter over the entire length. The aim of is to build a subreddit frequented by physicists, scientists, and those with a passion for physics. Neither you, nor the coeditors you shared it with will be able to recover it again. To do this you will have to break the circuit and place the current meter in series with the playdoh. Two identical resistors placed side by side have a total resistance that is half of either one of them.
At very high temperatures the resistance starts decreasing with temperature. We have also further developed the experiment to better understand how the resistivity of Play-Doh changes with time. Squishy Resistors Squishy Resistors Resistance depends on shape. This will introduce error in your experiment. Requests for permission to use such material on other projects may be submitted in writing to info aplusphysics.
But as shown by or data, this works for one and not for the other. Play Doh is modelling clay made out of flour oil and salt, the salt content enables it to conduct electricity so it has a measurable resistance. Material Playdoh A digital voltmeter 9 volt battery and battery holder. Here is the circuit with the buzzer. Richard Feynman, 1963 Objective: Measure dependence of resistance on diameter of resistor and determine the general relationship between the two quantitites. Put the data into a spreadsheet and you should have a beautiful decay curve. Please make an effort to engage the community rather than simply state your views and expect others to validate them.
Day Post Mon Tue Thu Fri How to use LaTeX? If in doubt, use the title of the original research. Make the piezoelectric buzzer buzz using the playdoh as a resistor. Feel free to provide links to additional sources in the comment section instead. Diameter, as well as vs. First, you will need to install one of the. Students will independently determine the resistivity of an unknown material Play-Doh using common electrical equipment available in the lab.
We aim to be a welcoming place for both academics and the general public, and as such posts with no basis in the current understanding of physics are not allowed as they might serve to misinform. Use a voltmeter to measure the voltage, V, between the nails. You may have to wrap aluminum foil around all the wire leads leads from bulbs to give the alligator clips a good grip. For each cylinder: Calculate its resistance using Ohm's Law; that is, find the ratio of voltage and current. The resistance, R, of a cylinder of playdoh is related to resistivity, p, length, L, and area, A.
As the cylinders are completed, bring them to the multimeter workstation for measurement in the circuit shown: Record voltage across 10 cm of material. Fill in the intermediate values next. Students have also used ammeters and voltmeters in the resistivity lab, though all the equipment is still quite unfamiliar. Students have also used ammeters and voltmeters in the resistivity lab, though all the equipment is still quite unfamiliar. The slope is represents resistance, or opposition to a flow of charge. We wished to create a lab experiment where the students have some control over the experimental design, data analysis is required, and students investigate the concept of resistivity as found in Halliday Resnick, and Walker. Experiment is the sole judge of scientific truth.
Pre-prints are accepted, but moderators reserve the right to delete any posts that break the rules regarding unscientific content. Your final report should include: Color of Play-Doh sample A table of Diameter in cm , Area in sq. Hypothesis: Formulate a hypothesis about how you think the resistance will vary with diameter. The resistance, R, depends on the length, L, and the cross sectional area, A, of the playdoh resistor. When you find the straight line, please determine its slope. Ohms law can be used to calcuate the resistance in ohms of the playdoh. The two measurements above should be made simultaneously! Cut the playdoh in half keeping the same diameter and repeat the measurement, to find the resistance of half the playdoh finger.