Fall2023 Ohms Law Lab Online-2

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University of Texas, San Antonio *

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1631

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Law

Date

Apr 3, 2024

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docx

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6

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Ohm’s Law Lab Online Purpose The purpose of this activity is to learn about Ohm’s Law, and to examine the different behaviors of Ohmic, and non-Ohmic materials when a voltage is applied to them. Theory Ohm’s Law tells us that resistance of an object is proportional to the voltage applied to it, and inversely proportional to the induced current passing through it. R = ∆V i A material is said to be Ohmic if the resistance of the material is independent of the applied voltage, meaning the ratio of ∆V i is constant. However, a material is said to be non-Ohmic if its resistance varies for changes in the applied voltage, meaning the ratio of ∆V i is not constant. The equation ∆V = iR is sometimes referred to as Ohm’s Law, but only in cases where the resistance is independent of the applied voltage. Ohm’s Law is not really a ‘law of nature’ but really just a description of a subclass of materials. Even for these materials if the temperature is changed enough the resistance will start to change for changes in the applied voltage. 1
Setup 1. Go to the following website: https://phet.colorado.edu/en/simulation/circuit-construction-kit-dc-virtual-lab 2. You should now see the following: 3. Click the down arrow to download the software. Once finished, you should see the following: 2
4. Near the bottom left of the screen, click on the Potential Difference symbol. 5. Near the top right of the screen, click on the Green/White Plus “Advanced” icon. Make sure the Wire Resistivity and Battery Resistance are both set to ‘tiny’, then click the Red Minus to close it. 6. In the White Box at the top right of your screen make sure “Show Current” is checked, select “Conventional”, make sure “Labels” is checked, and make sure that “Values” is checked. Procedure 1. On the Left side of your screen you will see a white box with the symbols of various basic circuit components. You will ‘Click and Drag” the various components to build simple circuit boards. 2. On the right side of your screen you will see a white box with a voltmeter and an ammeter. You will ‘insert’ these instruments into the circuit you build in order to measure the voltage and the current. 3. Build the following circuit: 3
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