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Found 10 results

  1. Electricity is cool. Electricity travelling through air is cooler. Well, it looks cooler at least. It's actually really hot. Jacob's Ladders are neat little devices that send a roughly-horizontal electrical arc travelling upward between two electrodes. Source: https://en.wikipedia.org/wiki/Spark_gap#Visual_entertainment This is a long exposure picture of a Jacob's Ladder - there's actually only one arc at any given time. The mechanism behind the ladder effect is actually pretty simple. When the arc initially forms, it heats the air up quite a bit, as is evident from the glow it produces. This hot air has more energy, so it expands, which decreases its density relative to the air around it. Since it's less dense, it experiences a buoyant force upward, and since the electrons can more freely travel through already-ionized air, the arc follows the hot air upwards. Once the arc reaches a length at which it can't keep the air hot enough to remain ionized, the arc breaks apart and the path of least resistance returns to being the very base of the ladder, so the process repeats.
  2. Name: Brainiac - Electric Fence Category: Electricity & Magnetism Date Added: 2017-12-18 Submitter: FizziksGuy Electric Fence Experiment Richard Hammond shows the Brainiacs how fun Electricity can be. Also, yes, if you are in the air when the electricity goes through, you don't get a shock. You don't get shocked if the circuit (box to fence to person to ground to box) doesn't complete. On top of that, the end where he ALMOST shakes Hammond's hand, he doesn't. Also, the slight gap in time between feet hitting ground and the shock can be attributed to the 1-2 second delay caused by the fence not being constantly on. Brainiac - Electric Fence
  3. Hey help plz . I tried solving it cant get it so far ....
  4. Name: (2 of 2) Electricity and Magnetism - Review of All Topics - AP Physics C Category: Exam Prep Date Added: 09 May 2014 - 01:00 PM Submitter: Flipping Physics Short Description: (2 of 2) Electricity and Magnetism - Review of All Topics - AP Physics C Content Times: 0:05 Ammeters and Voltmeters 0:44 Magnetic Force on a Moving Charge 1:12 The Right Hand Rule for Magnetic Force 2:05 Torque on a Current Carrying Loop in a Magnetic Field 2:22 Magnetic Force on a Curved Current Carrying Wire 2:55 Magnetic Force on a Current Carrying Loop in a Constant B Field 3:36 Net Force on a Charged Particle in a Constant Magnetic Field 4:09 Biot-Savart Law 4:40 Magnetic Field inside a Solenoid 5:31 Magnetic Field r distance away from a Current Carrying Wire 5:57 The Magnetic Force on Two Parallel Current Carrying Wires 7:03 Gauss' Law for Magnetic Fields 7:36 Faraday's Law of Induction 8:23 Lenz' Law - the Direction of the Inducted emf (with example) 10:21 Motional emf 11:17 emf in a Generator 12:06 Inductance & Self-Induced emf 12:38 The emf in an Inductor 13:13 RL Circuit (Putting energy into and getting energy out of the Inductor) 15:29 Energy Stored in an RL Circuit 15:42 LC Circuit (Simple Harmonic Motion) 17:15 Conservation of Energy in an LC Circuit Want View Video
  5. Name: (1 of 2) Electricity and Magnetism - Review of All Topics - AP Physics C Category: Exam Prep Date Added: 09 May 2014 - 12:54 PM Submitter: Flipping Physics Short Description: (1 of 2) Electricity and Magnetism - Review of All Topics - AP Physics C Content Times: 0:25 Coulomb's Law (Electric Force) 1:25 Electric Field (Definition and Caused by a Point Charge) 1:58 Electric Field Lines 2:23 Linear, Surface and Volumetric Charge Densities 2:44 Electric Flux 3:12 Gauss' Law (Everybody's Favorite!!) 4:58 Electric Potential Energy 5:12 Electric Potential Difference (Definition and Caused by a Point Charge) 6:13 Electric Potential Difference caused by a Continuous Charge Distribution 6:47 Electric Potential Difference with respect to the Electric Field 7:09 The Electron Volt 7:30 Capacitance (Definition and of a Parallel Plate Capacitor) 8:16 Capacitors in Series and Parallel 8:55 The Energy Stored in a Capacitor 9:14 Current 10:09 Resistance and Resistivity 10:45 Electric Power 11:11 Terminal Voltage vs. Electromotive Force (emf) 12:04 Resistors in Series and Parallel 12:37 Kirchhoff's Rules with Example Circuit Loop and Junction Equations 15:55 RC Circuit (Charging and Discharging) 18:17 The Time Constant View Video
  6. Name: 8 General Suggestions for the Free Response Questions of any AP Physics Exam Category: Exam Prep Date Added: 08 May 2014 - 09:21 AM Submitter: Flipping Physics Short Description: 8 General Suggestions for the Free Response Questions of any AP Physics Exam After 11 years of teaching AP Physics, going through countless old exams and grading an equally innumerable number of student solutions to Free Response Questions, here are my suggestions to help future students out. AP® is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, this product. Content Times: 0:21 #1) Pre-Read All Free Response Questions 0:56 #2) Write Legibly 1:47 #3) Organize Your Solutions and Label All Parts 2:32 #4) SHOW ALL YOUR WORK!! 4:06 #5) Do Not Break Forces in Free Body Diagrams into Components 4:41 #6) Answer Every Part of Every Problem 5:48 #7) Dimension Your Answers 6:11 #8) Leave Algebra Heavy Solutions for Later Next Video: Review of all AP Physics C Mechanics Topics - Video 1 of 2 All of my in-class AP Physics C lectures with Lecture Notes are at: 1¢/minute I know "equally innumerable number" perhaps seems illogical, however, it get's my point across, so deal with it. AP® is a registered trademark of the College Board, which was not involved in the production of, and does not endorse, this product. General Suggestion #9: Read Carefully. I made the video you are currently watching and then I proceeded to make video solutions to the 3 Free Response Questions of the 1998 AP Physics C Mechanics Exam and I learned a valuable lesson. I should have given 9 suggestions. I should have added a 9th suggestion: "Read Carefully." I find it quite funny that I didn't read carefully enough because (1) for years it is something I berated my students about and (2) it is something I did not do on the third free response question. You see, I didn't answer part (a) completely. I missed the small word "magnitude". I simply drew the forces in the Free Body Diagrams, however, I didn't explicitly solve for the Magnitudes of the Forces. All the magnitudes of the forces are in my solutions because I had to find each one to solve the rest of the problem; however, I didn't quite answer part (a) correctly. I don't know how the AP graders would grade my solution because all the physics is there, just not in the right places; however, I do feel they would not have given my solution full credit. So, please learn from my mistake and read the questions carefully. Don't have to eat humble pie, like me. View Video
  7. Name: Review of all Electricity and Magnetism Dimensions - AP Physics C Category: Exam Prep Date Added: 08 May 2014 - 09:17 AM Submitter: Flipping Physics Short Description: Review of all AP Physics C Electricity and Magnetism Dimensions This is a review of all of the dimensions used in AP Physics C - Electricity and Magnetism. Want a Table of Friends? Want to know what a View Video
  8. Electricity and music both are connected not only through electric instruments but through our brain. In the second video it compares the brain to an orchestra and shows how even sitting down relaxed your brain is constantly moving. I also have had EEGs in order to monitor how my brain works during a seizure. Once I got to see a picture of my brain and all the electric currents going to all sorts of areas of my brain. The seizure would start in two different places in my brain then continue seemingly randomly until it ends. We don't exactly know what causes my seizures but one problem my family has is that our brains always move to fast for us to do anything with a lot of the ideas we have. The first video on the other hand reminds me of my brother and how he was electrocuted at a young age. I wonder if we had any detectors connected to him how fast the frequencies would be going then. I think my favorite part of the video was when you could hear the sound because it added a whole different dimension to how your body can help transfer different frequencies. With all the sound you could hear from his detector it makes you wonder what happens when you are using your cell phone. What frequencies go through your body? Can this really cause cancer? These questions and so much more are constantly being asked like how does are neurons know how to organize themselves in the brain when no one instructs them where to go. The brain is one thing I can't wait for the scientists to understand better so we can understand the miracles that happen inside us everyday.
  9. lshads

    The AP Exams

    As late as it might be, I'd just like to take a bit to reflect on the ap exams. We worked our butts off to try and achieve the highest possible. I bough review books, took old practice exams, and worked out all part 2 problems from recent years. Needless to say, i was completely prepared by may to take that test. And yet, I still walked into that exam and came out a little uneasy. The mechanics exam was relatively straightfo​rward, with just one part two that gave me grief. However, mr. Fullerton put it best: "electrici​ty and magnetism was a bear". I hope I'm not the only one feeling this way.
  10. Weird things can happen in balloons. They're affected a lot by static electricity. This is why it will stick to a wall or your clothes after it has been rubbed against something else, like your hair. This happens because of the charge of the balloon and whatever you're trying to stick it to. Something that is charged negatively will stick to something that is positively charged. If you rub a balloon against your head, it becomes negatively charged because it gains electrons from your hair. This picture shows what happens when you put a charged balloon on a wall. The balloon is negatively charged. When the balloon comes in contact with the wall, the wall and the balloon both become polarized. The negative particles in the balloon are attracted to the positive particles in the wall, and also push the negative ones in the wall away, so they stick and the balloon appears to be floating all by itself. Another thing that can happen is that two balloons can repel each other. If two different balloons are rubbed against your hair or clothes or anything else that loses electrons, they will both become negatively charged by gaining electrons. If they are brought near each other, they will want to repel. But it my opinion, it is more fun to see balloons stick to things. Like this cat.
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