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Science Olympiad 2014 Coaches Clinic MSU Circuit Lab (C). Changes from 2013. Theory 50-75%Practical 25-50% Was 50-50 New topics History, Wheatstone Bridge Digital Logic Combinatorial only, no sequential circuits Schematic Symbols Boolean Logic, equations Circuit Simplification. - PowerPoint PPT Presentation
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Science Olympiad2014 Coaches Clinic
MSU
Circuit Lab (C)
2
Changes from 2013
• Theory 50-75% Practical 25-50%– Was 50-50
• New topics– History, Wheatstone Bridge– Digital Logic
• Combinatorial only, no sequential circuits• Schematic Symbols• Boolean Logic, equations• Circuit Simplification
3
Electronics is
Problem Solving
• Draw a schematic of an actual device
• Identify real parts (R, C, …)
• Read part parameters:values, tolerance, wattage,working voltage …
4
Engineering Terminology
• Metric Prefix Engineering Units 3.15 kΩ, 0.22 μF 1,255 kwh 4.7 mH
• Not Scientific Notation
• Confusion m (milli) M (mega)
s (second) S (Siemens)
5
Hints
• Answer the Question !!
• Units– If it asks for volts, don’t answer in amps
• Dimensional analysis – sanity check
• Shouldn’t get more out than in
• Get hands-on familiar with the real stuff
6
Practical Portion
• Open ended – not cook book
– Build something from a “bucket” of parts, power it up, then measure some things.
– Draw a schematic, ID parts and values from a circuit board.
7
Problem Areas(from 2013)
• Familiarity with parts
8
??? How to hookup?
What goeswhere?
9
How to Measure?
• Hook up the meter ?– Ohms– Volts– Amps
• Auto Scale vs. Manual
• AC vs. DC
• Common Sense “Sanity” Check
10
Hands On Practice
• Students need to build circuits• Measure voltage and current in circuit
– Voltage Across– Current Through– Blow fuses ???– Ground ?
11
Regional Level
• Broad topic coverage
• General basic concepts
• Mostly single step “Forward” problems
• But thought provoking, not just memory
12
State Level
• Teams have already succeeded at Regional
• We assume they can do Ohm’s law and other simple one-step problems
• Memorization of formulae will not be successful – teams will need to APPLY the fundamental principles to solve the problems.!
• Multi Step “Backwards” solutions
13
Sample Questions
• Taken (modified) from 2013
• Do NOT take as a definitive sample
• 2014 will have topics not shown
• Intent is to show level of complexity, “word problem” context, and schematics.
• NOTE: Digital logic not in 2013, but will be in 2014.
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