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Material Type: Lab; Class: Intro to Electrical Lab; Subject: Electrical Engineering; University: Morgan State University; Term: Unknown 1989;
Typology: Lab Reports
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Prior to arriving in lab for Assignment #1, each student is responsible for purchasing a toolbox for EEGR203. The box contains most of the things you will need for this class such as breadboard, resistors, op-amp, etc. If you don’t know where to get one, ask your classmates or your instructor for his assistant.
This lab provides an introduction to the test equipment that is used throughout the EEGR203 and other EEGR courses that you will encounter as you pursue your career. In the first exercise, the resistance of a resistor will be calculated using the color-codes and after which we will then use a digital multimeter (DMM) to measured the value of the same resistor. Next, a DMM is used to measure dc voltage of the bench power supply and the dc current that is drawn from the power supply when it is loaded with a simple resistive network. For the second exercise, AC (ALTERNATING CURRENT) voltages are generated with a function generator and are measured using a DMM and a digital oscilloscope. Unlike the DMM, which computes a time-average voltage or current, a digital oscilloscope displays graphs of voltage or current versus time on a liquid crystal display (LCD). The waves generated by the function generator through the oscilloscope used to explore important features of the oscilloscope including time base, voltage base, triggering, and ac / dc coupling.
Resistor color code and its uses
A color code is used to identify the resistance and tolerance of resistors without having to measure them using a digital multi-meter or ohmmeter. Resistors that have tolerances of 5% or greater have four color bands, whereas resistors with tolerances of 1% or less have five color bands. The color code and method to compute the resistance and tolerance are given below and on attached sheet.
Tolerance Color Codes
No Band = 20% Silver = 10 % Gold = 5% Red=2%
Expressions to Determine Resistance and Tolerance
≥ 5% R = AB x 10C, tolerance = D ≤ 1% R = ABC x 10D, tolerance = E
For example, a 2 kΩ resistor with a tolerance of 5% has a color code of Red, Black, Red, Gold. Using the expression for a resistor with a tolerance ≥ 5% (four color bands) gives:
Resistance value = (red black) x10red^ or 20 x 10^2 = 2000 Tolerance = gold Therefore 5% tolerance. 5% of 2000 = 100
Therefore, this 2kΩ resistor can have a value between 1100Ω and 1900Ω.
Part 1:
together as shown in the circuit in Figure 2. Connect the voltage supply as shown with Vs = 8 V. Measure voltages V1, V2, V3 and the current through each of the resistors. Be sure to write down the values of each of the resistors, both the value indicated by the color bands and the values you measure using the DMM. Ask for help if you need it.
Figure 2
a. Record the value of V1, V2, and V3 that you deduced using Ohms law in the Table 1. b. Record the value of V1, V2, and V3 that you measured using the DMM c. Repeat parts a and b for the currents and also record the values in Table 2.
Do the calculated and measured values agree? Comment on why you think the values matched or why they did not if that is the case with your result.
Measured Voltage Deduced Voltage Difference V1= V1= V2= V2= V3= V3=
Measured Current Deduced Current Difference I 1= I 1= I 2= I 2= I 3= I 3=
Assignment