PHY111: Summer Lesson 07: Electricity & Magnetism I -E&M Vocabulary -AC/DC Circuits -Resistance Calculations -Ohm’s Law -Kirchoff’s Rules -Electrostatics 1/9

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 #8 #22 #23 #34 #35 #37 #44 #49 2/9 Work Space:

E&M Vocabulary: As a class, define the following: (take note of these as we go over them…) ChargeVoltageCurrentResistance CircuitAmperageVoltsWatts PowerCoulombsMagnetic Field Electric Field Electromagnetism BatteryResistorCapacitorAmmeter VoltmeterOhmmeterMultimeter Alternating CurrentDirect CurrentFrequency 3/9

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: -A similar device… -A future lab…! -Community demos! -I have done community demos like this – this fellow reminds me of myself—he is a little crazy. ;0) 4/9

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! 5/9 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”?

Notes on Circuits: 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 ) 6/9 Work Space:

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

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

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. 9/9