Transcript Lesson 07x - MrLaFazia.com

PHY111: Summer 201253
Lesson 07: Electricity & Magnetism I
-
E&M Vocabulary
AC/DC Circuits
Resistance Calculations
Ohm’s Law
Kirchoff’s Rules
Electrostatics
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Test I Analysis:
The following 9 questions were found to be critical-need areas.
Let us take some time to go over them: [Open exam file]
(9 questions)
#4
Work Space:
#8
#22
#23
#34
#35
#37
#44
#49
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E&M Vocabulary:
As a class, define the following:
(take note of these as we go over them…)
Charge
Voltage
Circuit
Power
Current
Amperage
Coulombs
Alternating Current
Watts
Electromagnetism
Resistor
Voltmeter
Volts
Magnetic Field
Electric Field
Battery
Resistance
Capacitor
Ohmmeter
Ammeter
Multimeter
Direct Current
Frequency
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Van de graaff is busted… :
New parts are being ordered for the Van de graaff generators.
So for now…!
1) Discuss function of Van de graaff (how it works!)
2) View clips:
-
Myth busters: http://www.youtube.com/watch?v=7qgM1A3pgkQ&feature=related
A similar device… http://www.youtube.com/watch?NR=1&v=SlNGKly09CQ&feature=fvwp
A future lab…! http://www.youtube.com/watch?v=ml6GWVlPCPM
Community demos! http://www.youtube.com/watch?v=ubZuSZYVBng&feature=related
- I have done community demos like this – this fellow reminds me of myself—he is a little
crazy. ;0)
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A true experiment…
I have never before done this…so this really is an experiment
for us:
The premise is that all electric fields within a cage will be cancelled out due to the
properties of the conductive material and the rearrangement of the electrically
charged particles…
Let’s try it on two things:
1) Walkie-talkies!
2) Cell phones!
Follow-up Qs: “How does this relate to being in a car in an electrical storm”?
“How does this relate to phone reception in some buildings”?
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Notes on Circuits:
Point 1:
Point 2:
Point 3:
Point 4:
Point 5:
Example of a Series Circuit
Example of a Parallel Circuit
Ohm’s Law (showing triangle method, too)
Kirchoff’s Laws (how current & voltage act in circuits)
Finding “Equivalent Resistances” (or RTOTAL)
Work Space:
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I have semi-randomly assigned groups and will call out the group names when I am ready for you to begin.
Lab 4: Circuits Simulation
This is a ten-point lab. 6 of the points are based solely on your
group’s ability to follow directions and participate in the following:
Successful Completion of Series Circuit (3 points)
Successful Completion of Parallel Circuit (3 points)
The final 4 points are earned by taking what you have learned by
example and applying it to a slightly more complex system:
Successful Completion of a Series-Parallel Circuit (4 points)
I will come around and have you test your final circuit when you feel
your group’s simulation is ready. I will then award up to 4 points for
your circuit based on how well it performs. [Once your project has
been graded, you are dismissed].
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Grades/Assignments:
Read Sections 11.1, 11.2, 11.4; 13.1.
Lab 4 will have been graded through visual inspection of
results.
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Looking Ahead:
Lesson 08 will be an online lesson on Electromagnetism and
Electromagnetic Waves. The relationship between electricity
and magnetism is a fundamental aspect of nature which
deserves attention.
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