edited Phys2 Lab6

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School

New York University *

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UA12

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Electrical Engineering

Date

May 14, 2024

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pdf

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8

Uploaded by superduperhwhelper

Lab #6: Voltage, Current, and Resistance II PHYS-UA12 Professor S. Yu
1 Objective and Description In this experiment, students are able to expand upon knowledge of voltage, current, and resistance from lecture and the previous lab. In part I of this experiment, resistors are measured in series and parallel. This is also observed in this experiment but rather than taking three different measurements, AC capabilities of the signal generator are used to obtain continuous measurements of current and voltage. This is accomplished through the use of the virtual simulation database from phet.colorado.edu. Theory There are a few significant equations from the previous lab that are still relevant. One such is Ohm's law, where V=IR. Additionally, there is a difference in resistance depending on if it is in parallel or series. If 2 resistors are connected in series, the equivalent as a single resistor is R=R 1 + R 2 . If 2 resistors are connected in parallel, the equivalent to a single resistor is . 1 𝑅 = 1 𝑅 1 + 1 𝑅 2 Procedure Using the virtual simulation database, a 33Ω and 100 Ω resistors are connected in series. Using the voltmeter, the resistance is found for applied voltages of 1 through 7. This is compared to the theoretical values that are calculated using Ohm’s Law. It is important to note the placement of the voltmeter and current meter. In order to measure the voltage, the voltmeter must be placed in parallel across the device. To measure the current, the current meter must be in series. In series, the overall resistance value of the circuit is found using the current obtained from the analog current meter for the DC voltages of 1 through 7. Next, the resistance values are calculated for the same resistors in parallel and compared to the theoretical value. The applied DC voltages of 1 V to 7 V are used again. Data and Calculations
2 Resistors in Series Voltage (V) Current (A) Resistance (R=V/I) (Ω) Theoretical Resistance 1 0.008 125 R=R 1 +R 2 =33Ω+100Ω =133Ω 2 0.015 133.33 3 0.02 150 4 0.03 133.33 5 0.04 125 6 0.05 120 7 0.05 140 Table 1 . Resistors in Series Figure 1. Voltage vs. Current for Resistors in Series Resistors in Parallel Voltage (V) Current (A) Resistance (R=V/I) (Ω) Theoretical Resistance 1 0.04 25 1 𝑅 = 1 𝑅 1 + 1 𝑅 2 2 0.08 25
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