Prelab 3: EE 1106, Intro to EE – Freshman Practicum, Fall 2014
Assigned Week 2, DUE WEEK 3 BEFORE START OF LECTURE (BEFORE 2:00 PM)
Instructions:
There are seven types of questions that you will be asked in Prelab Assignments:
1. Reading Assignments:
· Readings are NOT GRADED, but are NECESSARY to answer other questions, so read them!
· Readings may be from the textbook or online course materials. You may also be asked to do your own independent research to answer some questions.
· For your own research, you may use ANY books or online RESOURCES that you wish, but YOU MUST CITE ALL SOURCES USED (including the textbook and online course materials) at the end of the submitted prelab assignment. A simple web link or book title and author will suffice.
2. Numerical Answer Questions:
· Numerical answer questions are GRADED, and require you to solve for a NUMBER AND a UNIT.
· The answer should be TYPED (not drawn), and SHOW as part of your answer ALL WORK that you used to arrive at your answer, including all formulas, constants, and assumptions.
3. Formula Answer Questions:
· Formula answer questions are GRADED, and will require you to show a FORMULA that answers the question. The formula will be readily available from the book or online.
· You must EXPLAIN what EACH VARIABLE is to demonstrate that you understand the formula.
4. Graphical Answer Questions:
· Graphical answer questions are GRADED, and will require you to produce a DIAGRAM, PLOT, WAVEFORM, SCREENSHOT, or other figure to answer the question.
· LABEL ALL PARTS of the figure, such as plot and waveform axes, vertical and horizontal scale, important parts of a diagram, etc. Also CITE any FIGURES you did not create yourself.
· If the question asks for a hand drawing/sketch, attach a picture/scan of your drawing as figure.
5. Short Written Answer Questions:
· Short written answer questions are GRADED, and typically require 1 – 3 clear, DETAILED SENTENCES that answer the question in the context of Electrical Engineering.
6. Long Written Answer Questions:
· Long written answer questions are GRADED, and typically require 3 – 5 clear, DETAILED SENTENCES that answer the question in the context of Electrical Engineering.
· You may also be asked to attach a complete programming code to your prelab (often more than 5 sentences). APPEND CODE and other large amounts of text AT THE END of your prelab.
7. Questions from the Textbook:
· Textbook questions are GRADED, and TYPED. FOLLOW TEXTBOOK INSTRUCTIONS, and be sure that you are answering the correct question. (Concept questions and Exercises are different!)
For submission, compile all answer text, code, sketches, plots, and images into a SINGLE PDF DOCUMENT and name the document 'FirstName_LastName_Prelab_X’, where FirstName is your first name, LastName is your last name, and X is the prelab assignment number. Make sure each answer is clearly labeled with the correct problem number. They do not have to be in order. It is not necessary to include these instructions or the original questions in your submission although you may if you wish. SUBMIT the document ON THE UTA BLACKBOARD https://elearn.uta.edu. For full credit, also bring this document in printed form to the lab-lecture and submit it during the first 5 minutes of class. To enter Blackboard, login with your UTA NetID and password, click the link ‘EE 1106 Freshman Practicum’ in the ‘Course List’ section on the upper left. Submit the assignment under Course Materials > Prelabs > Prelab X, where X is the appropriate prelab assignment number. If these submission guidelines are not followed, you may lose a significant number of points from your prelab grade. You are encouraged to consult with your classmates while you work on the prelab, however, writing, coding, sketching, plotting and understanding of final submissions MUST BE YOUR OWN WORK. You may be quizzed over submitted work at any time, and if you cannot demonstrate that you understand your submitted work, you may lose points from your grade.
Using the instructions on the previous page as a guide, answer the following questions (total 100 points):
Reading Assignments:
1) (Reading Assignment) Read ‘Multimeter Basics’ on the class website, under Lab Information EE 1106 > Lab 3 Handout.
2) (Reading Assignment) Research Ohm’s Law in order to answer the questions below.
Questions:
1) (Formula Answer) What is Ohm’s Law? (10 points)
2) (Numerical Answer) If the voltage across a resistor is 10V, and the resistance of the resistor is 10 Ohms, what is the current flowing through the resistor? (10 points)
3) (Graphical Answer) What is the graph of the function y = sin(x) from x = 0 to x = 2π? (10 points)
4) (Graphical Answer) Sketch the graph of the function y = cos(x). (10 points)
5) (Short Written Answer) What is Ohm’s Law? (10 points)
6) (Long Written Answer) Explain Ohm’s Law. (10 points)
7) (Long Written Answer) Write the C code a ‘for’ loop with that iterates 100 times, and adds 10 to a variable each time through the loop, then prints the value of the variable after the loop is complete. (10 points)
8) (Textbook) Solve Concept Question 1-1 and Exercise 1-2. (5 points each, total 10 points)
9) (Long Written Answer) What is the purpose of Lab 3? (20 points)
THIS IS AN EXAMPLE OF ANSWERS FOR THE ABOVE PRELAB ASSIGNMENT
Problem 1:
Ohm’s Law is V = IR, where V is voltage across a circuit element, I is current through the circuit element, and R is the resistance of the circuit element.
Problem 2:
Ohm’s Law: V = IR à I= VR= 10V10Ω=1 A
Problem 3:
Problem 4:
Problem 5:
Ohm’s Law states that the voltage across a resistive circuit element is proportional to the current flowing through the element, and the resistance of the element. Also, it states that resistance and current are inversely proportional if voltage is constant.
Problem 6:
Ohm’s law was invented by Georg Ohm to explain the behavior of resistive circuit elements. It relates voltage, current and resistance in a linear fashion that allows any of the three to be calculated if the other is known. The law states that voltage across a resistive element (in Volts) is equal to the product of the current through that element (in Amps), and the resistance of the element (in Ohms). Therefore, the current will be equal to the voltage divided by the resistance, and the resistance will be equal to the voltage divided by the current. So, increasing the voltage across a resistor of constant value will cause the current to increase, and vice versa. Decreasing the resistance of a resistor connected to a constant voltage will increase the current, and decreasing the resistance of a resistor subjected to a constant current source will decrease the voltage across it (increasing resistance will have the reverse effect in both cases).
Problem 7:
See Appendix.
Problem 8:
Concept Question 1-1: A system is the overall electronic entity, a circuit is a subsystem of the overall system, and the individual elements of the circuits are known as devices or components.
Exercise 1-2: a) 83.2 MHz, b) 16.7 nm, c) 979 ag, d) 44.8TV, e) 762 bits/s
Problem 9:
The purpose of Lab 3 is to teach the students how to use the NI MyDAQ, specifically how to use it as a Digital Multimeter (DMM), and how to output a signal to a specified physical output on the MyDAQ. Another purpose of Lab 3 is to continue to teach the students how to use LabVIEW. The students will design a Digital Multimeter and Voltage Generator using LabVIEW, and will use the DMM to measure several resistance, voltage, and current values.
Sources:
1. “Circuits”, by Ulaby
2. “Multimeter Basics”, by Dan Popa
OR
2. http://www.uta.edu/faculty/popa/intro_EE/Multimeter-Basics.pdf
3. https://learn.sparkfun.com/tutorials/voltage-current-resistance-and-ohms-law
4. http://etc.usf.edu/clipart/36700/36729/sine_36729.htm
Appendix:
Code for problem 7:
int x;
int variable;
for(x = 0; x < 100; x++){
variable = variable + 10;
}
printf(“Variable value is: %d”, variable);