DC circuits template with parameters SLAPE

pdf

School

Arizona State University *

*We aren’t endorsed by this school

Course

114

Subject

Electrical Engineering

Date

Dec 6, 2023

Type

pdf

Pages

Uploaded by CorporalJellyfishMaster647

1 (1 point) Title of the Experiment: DC Circuits Ohm ’ s Law Student’s name: Karlie Slape Section SLN: PHY 114 online TA’s Name: Adway Gupta Date of the experiment: 11/10/23

2 Objective: (3 points) Ohm ’ s law states that “ electric current through a conductor between two points is directly proportional to the voltage across the two points. ” In this lab we will be using Ohm ’ s law to calculate the resistance of pencil led in PhET virtual simulation. For the second part, we will be testing Kirchhoff ’ s rules of voltage and currents in a simulation. We will be finding the condition for maximum power transfer in a DC circuit. *Edit: this part has been omitted due to lack of KET.* Experimental Data (3 points): Data Analysis (10 points): Be sure to include equations! Part 1: Using your graph and equation 1.2, find the resistance of the pencil lead. V/I=R=const The resistance is the slope, 24.98 Calculate the uncertainty for the resistance. R average= 25.0316 R graph= 24.98 Uncertainty= 0.052(calculated) Graph uncertainty= 0.026 Calculate the length of the pencil lead. p= 3.3*10^-4 diameter=0.6mm 24.98* (1.13*10^-6)/3.3*10^-4= 0.086m

3 Part 2.1: Verify that the junction rule holds for junction A or B Verify that the loop rule holds for loop 1 and loop 2 Part 2.2: Calculate the percent discrepancy of the fitting values from your graph and the actual values from your circuit. Results (3 points) Table 1: Resistance and uncertainty of pencil lead (units) R=24.98ohms Uncertainty=0.052(calc) 0.026(graphed) Length of pencil lead (units) 0.086m Table 2: (Highlighted values have circuit value as indicated in the list of parameters on Canvas- Module 5) Circuit value Curve fit parameter value Percent discrepancy V s (units) R s (units) Post Lab Questions (5 points): 1. Why does the slope of your I vs. V graph represent R? The slope of the graph represents R because the current is directly proportional to voltage according to Ohm ’ s law. This means that I is proportional to V. 2. Did the currents for junctions A or B add up to zero? 3. Did the voltages around loop 1 and loop 2 add up to zero? 4. From your fit what value of R L maximizes the power in the load? 5. How does it compare to our simulated internal resistance of the battery set to 5 Ω?

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

4 Discussion and Conclusion (5 points): Our objective for this lab was to test Ohm ’ s law that current is proportional to voltage in a circuit. During our experiment, we used a virtual circuit and calculated the resistance. We found that when graphed, it did indeed create an almost perfect linear graph. We found a resistance of 24.98ohms with an uncertainty of approximately 0.02-0.05. My graph had a different uncertainty than what I calculated myself. The length of the lead was found to be 0.086m. In conclusion, we accept Ohm ’ s law as accurate. Voltage is directly proportional to current.