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ENGS2613 Intro Electrical Science
Week 6
Dr. George Scheets
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Read 4.9 – 4.12
Problems 4.26, 47, 61, 64, 65, & 79
Exam 1 Results
Hi = 100, Low = 23, Ave = 67.40, Deviation = 15.82
A > 89, B > 75, C > 61, D > 46
50 Minute Design on Friday
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Open Book, Notes, & Team Mate(s)
2
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or 3 person teams
Closed
 Open
Collaboration with Other Teams
 Listening In is OK (= Corporate Espionage)
Calculator OK
 Smart Phones NOT OK
 Assigned Seating
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Example:Mini-Design
Specifications:
Input Current Value
Desired Output Voltage
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R1
R2
Need 12.38 Ω resistors? Use it.
Resistors available: 1, 2, …, 9; x1, x10, x100, x1000 etc
Resistor Wattage Ratings available: 0.1, 1, 10, 100, 1K, etc.
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↑
Revise for manufacture (Need Circuit Diagram w/Wattages)
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Vout = 7.4 V
0.017 A
Specify R1 & R2 Exactly
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Your Design
Must be > wattage absorbed, else resistors will fry.
Price Design: $ Cost per resistor = Wattage Rating
Calculate Vout using Design for Manufacture (Vman)
Calculate Figure of Merit [1 + 9|Vman-7.4|](Σ $Resistors )1.3
Extra Credit for 5 Working Designs w/Lowest FoM
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Per Version (4 Versions)
Thevenin Equivalent Circuits
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Any 2 terminal
resistive circuit….
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Can be replaced
with …
Fancy Circuit
with
Resistors
&
Voltage and/or
Current sources
+
Vth
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Anything attached
to 2 output leads will
see same voltage & current
Rth