Transcript Science Olympiad 2014 Coach’s Clinic MSU Circuit Lab (C)

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
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Combinatorial only, no sequential circuits
Schematic Symbols
Boolean Logic, equations
Circuit Simplification
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Electronics
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Problem Solving
• Draw a schematic of an actual device
• Identify real parts (R, C, …)
• Read part parameters:
values, tolerance, wattage,
working voltage …
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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)
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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
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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.
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Problem Areas
(from 2013)
• Familiarity with parts
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???
How to hookup?
What goes
where?
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How to Measure?
• Hook up the meter ?
– Ohms
– Volts
– Amps
• Auto Scale vs. Manual
• AC vs. DC
• Common Sense “Sanity” Check
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Hands On Practice
• Students need to build circuits
• Measure voltage and current in circuit
– Voltage Across
– Current Through
– Blow fuses ???
– Ground ?
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Regional Level
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Broad topic coverage
General basic concepts
Mostly single step “Forward” problems
But thought provoking, not just memory
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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
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Sample Questions
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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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