Lab Report EE330 L

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Grossmont College *

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330

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Electrical Engineering

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Dec 6, 2023

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pdf

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EE 330L - ENGR ELECTRONICS LAB Department of Electrical & Computer Engineering San Diego State University LAB REPORT #1 Experiment #1 - Measuring DC Voltages and Currents Members Name’s : Maria Dawood & Joseph Solis Class section : EE 330L-05 Class time : Wed 1300-1540 Date : 09/08/21

Objective: This lab was purposely meant for the students to become more familiar with the equipment and how each of the individual equipment works. For example, digital multimeter (DMM) and the power supply (PS). Therefore, this lab was also meant to make students more comfortable with measuring the voltage and current of a circuit using the equipment and also measuring a resistor’s resistance using the DMM. For that reason, this will allow the students to have a better understanding of how each piece of equipment works, therefore for future labs they would be able to debug the techniques. Theoretical Background : It is very important to understand the basic concepts of how circuits work for this experiment. For example, knowing how each of the individual formulas works, such as Ohm’s law: voltage(V) = resistance(R) * current(I). The second most important concept was when the components in parallel have the same voltage drop and that the current in series remains the same. It is also important to understand how to properly build and ground a circuit to prevent shortages or damage to any of the lab instruments. To start off, we had to measure the current within the circuit, to do that we first had to place the DMM in series with the resistor and set it as an ammeter. However, to measure the voltage of a component of the circuit, the DMM must be placed in parallel with the component and be set as a voltmeter. It is also important to note that the power supply must be connected to the DMM and measured before being connected to the circuit to ensure that the measured, output power is the desired value

Procedure: We initially set the DMM as a voltmeter, connecting it to the power supply (PS) so that we can test and measure the voltage that was coming from the PS. There were several voltages that were tested, 1V, 2.5V, and 6V, to make sure that the DMM set in DC Voltage was reading that number, or at least very close to it. Our measurements of the voltage came out as 1.006V, 2.503V, and 6.005V respectively, and as a result, the DMM was effectively reading the voltage correctly. The next step was to measure each resistor’s nominal value of 1K, 5K, and 10K, by switching the DMM to measure resistance, and connecting the leads to the resistor. Our measured values for each resistor were: 0.989K Ohms for 1K resistor. 4.9992K Ohms for 5K resistor. 9.818K Ohms for 10K resistor. To calculate the percentage difference between the nominal and measured values of the resistors, it was (Measured - Nominal)/Nominal X 100. For the 1K difference, it was 1.06%, 5K was 0.08%, and 10K was 1.82% . After measuring the nominal values, each resistor was inserted into the circuit, one at a time, where the PS connected to the resistor, and the voltmeter was connected

in parallel to the resistor to measure the voltage across that resistor. The PS was set at 10V and the voltage across each resistor was measured. All voltages that were measured across each resistor came out to be 10V. The circuit now had to be reconfigured a bit, so that the DMM was set up as an ammeter to measure current going through the circuit. This ammeter was connected in series with the rest of the circuit. We first had to make calculated values of the current for the circuit with each of the 3 resistors. The calculations were done using Ohm’s law: V=IR and converted to I=V/R to calculate the current. The calculated current for the circuit with 1K resistor was 10.1065mA For the circuit with the 5K resistor, it was 2.0003mA.

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