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Lab6

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this is the lab for purdue ece151 matlab
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Purdue University Calumet
Enginerning Department
ENGR 151
Software tools for engineers
LAB 6
Due date: Monday March 4, 2013
* Purpose: To visualize an equation and use a combination of FOR loop and IF-END
statement to find the solution to a simple engineering problem.
* Step 1: Create a new script file LASTNAME LAB6.m. Answer the following ques-
tions by writing in the script file
- Clear screen
- Clear workspace
- Display your name
- Display the text "Part 1"
- Generate 1000 random numbers from 4 to 7 and count up the number of elements
that are > 5 and < 6 and display the result using SPRINTF.
- Display the text "Part 2"
- Using what you have learned in the last several labs it is desired to first make a
plot of the following equation:
10
P = RL
RL + 20
The equation is derived from the circuit shown below:
1

Purdue University Calumet
Enginerning Department
The Y axis variable P is power of the resistor RL which is transferred from a
battery modeled as a voltage source VT h equal to 10 V also having and internal
heating loss modeled by RT h = 20 Ohms .
It is desired to plot the power P on the Y axis in terms of the load resistance
RL on the X axis for the purpose of estimating the value of RL which results in
a maximum value of P . Assume the input RL, changes from 0 to 40 Ohms with
a step size of 0.1 Ohms. Create the plot described above and add a title, the
appropriate x and y labels and lastly activate a grid to aid in reading the plot.
- Display the text "Part 3"
- Use a FOR loop starting at RL = 0 having an ohmic step size of 0.001 ohms to
find the value of RL which makes power P maximum. You will need to include
an appropriate IF statement in your code to determine when the maximum value
of P is reached and stop the FOR loop using the BREAK command. Lastly, use
a combination of the SPRINTF and DISP commands to print out the solution
found for the value of RL and the corresponding value of load power P.
Hint: You can use the plot to determine an approximate answer for comparison
purposes.
* Step 2: Upload the file LASTNAME LAB6.m to blackboard.
2

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