PHY-116 Lab 3

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Jan 9, 2024

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Kevin Austin PHY-116 Lab Report 3 1. What is the expected value of connecting the three previous resistors in series? R T = 993 Ω + 100 Ω + 2.18 k Ω = ¿ 3.273 k Ω 2. What is the equivalent total series resistance? 3.27k Ω 3. What is the percent of error between the theoretical and measured values of series resistance? 3.273 k Ω − 3.27 k 0 Ω 3.27 k Ω × 100% = 0.0917% Nominal Resistor Measured Resistance Value Measured Current Measured Voltage Measured Voltage/Current 100 Ω 100 Ω 0.43mA 0.05V 116 Ω 1k Ω 993 Ω 0.43mA 0.47V 1093. Ω 2.2k Ω 2.18k Ω 0.43mA 1.03V 2395 Ω Table 1 : Series Circuit

4. Compare the two values of resistance (measured directly with the DMM) and calculated by dividing voltage by current. Are they similar? What can you say about these values? The measured voltage/current is higher than the resistance I measured using the DMM. 5. What is the expected value of connecting the three previous resistors in parallel? 87.2 Ω 6. What is the equivalent parallel resistance? 88.2 Ω Nominal Resistor Measured Resistance Value Measured Current Measured Voltage Measured Voltage/Current 100 Ω 100 Ω 12.1mA 1.32V 109 Ω 1k Ω 993 Ω 1.29mA 1.31V 1015 Ω 2.2k Ω 2.18k Ω 0.1mA 0.19 V 1900 Ω Table 2: Parallel Circuit Introduction The purpose of this lab exercise is to teach me how resistors are used in series and in parallel electrical circuits. This experiment helped me understand the fundamental concepts of electrical circuits and how the arrangement of resistors can affect the overall resistance and current flow within a circuit. Procedure First I grabbed all four resistors in my lab kit and measured them to identify the 100 Ω , 1k Ω , and 2.2k Ω resistors. Once I identified them the actual resistance came out to 100 Ω , 993 Ω and 2.18k Ω . I assembled the resistors in series and measured the current through each resistor and logged the values in table 1. Then I disconnected the

DMM and closed the circuit with a jumper cable and measured the voltage across each resistor and logged the values in table 1. Using Ohm’s law I was able to calculate the resistance of the measured voltage and current and logged them into table 1.The values of the measured voltage/current is higher than the resistance I measured using the DMM. Next I built a parallel circuit using the same resistors and measured current and voltage through each resistor and logged the values into table 2. Once again, using Ohm’s law I was able to calculate the resistance. In conclusion, I enjoyed building these two circuits, I did have difficulty building the parallel circuit because I got confused about the configuration. After watching some videos I was able to figure it out.

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