PHY111: Summer 201253
E&M Vocabulary
AC/DC Circuits
Resistance Calculations
Ohm’s Law
Kirchoff’s Rules
Electrostatics
1/9

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
2/9

As a class, define the following:
(take note of these as we go over them…)
Charge
Circuit
Voltage Current
Amperage Volts
Resistance
Watts
Power Coulombs Magnetic Field
Electric Field Electromagnetism
Battery Resistor Capacitor Ammeter
Voltmeter Ohmmeter Multimeter
Alternating Current Direct Current Frequency
3/9

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)
4/9

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 Q s : “How does this relate to being in a car in an electrical storm”?
“How does this relate to phone reception in some buildings”?
5/9

Point 1: Example of a Series Circuit
Point 2: Example of a Parallel Circuit
Point 3: Ohm’s Law (showing triangle method, too)
Point 4: Kirchoff’s Laws (how current & voltage act in circuits)
Point 5: Finding “Equivalent Resistances” (or R
TOTAL
)
Work Space:
6/9

I have semi-randomly assigned groups and will call out the group names when I am ready for you to begin.
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] .
7/9

Read Sections 11.1, 11.2, 11.4; 13.1.
Lab 4 will have been graded through visual inspection of results.
8/9

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.
9/9