PHYS 203

Videos

Spring 2010

No. Label Time Title Description
1 E & M I, #1 3:16 Interaction of Charge The interaction between charges is examined by observing two rods, one made of polyvinyl chloride (or PVC), and the other made of acrylic.  The gray PVC rod is charged negatively by rubbing it with animal fur.  The clear acrylic rod is charged positively by rubbing it with a silk cloth.
2 I, #2 3:17 Distribution of Charge
  on a Conductor
Charge is placed on two conductive objects.  The first object shows that charge resides only on the outer surface.  Electroscope measurements taken on the second object reveals that charge concentrates at pointed surfaces.
3 I, #3 2:21 Induction of Charge A negatively charged PVC rod is used to induce charge on two metal bars.  The mechanism of induction is explained and Conservation of Charge is demonstrated.
4 II, #1 2:50 Corona Discharge
Electronic Precipitator
Smoke particles within a glass cylinder are removed by applying a surplus of opposite charges to electrodes located at each end of the cylinder.
5 II, #2 3:21 Electric Fields:
Mapping of Force Fields
A variety of electrodes are placed in an apparatus containing a suspension of oil and synthetic fibers.  The fibers align themselves along lines of constant electric force when charge is placed on the electrodes.
6 I, #6 3:44 Corona Discharge: Detection of Electric Wind A corona discharge is initiated with a household candle located between electrodes. The candle flame reveals the existence of the ions in motion.
7 I, #7 2:56 Momentum of an Electron: Motion Imparted During Collision This video demonstrates the acceleration of electrons by an electric potential and transfer of momentum that occurs during collision. Electrons are accelerated across an evacuated chamber, striking the blades of a paddle-wheel en route.
8 II, #3 2:12 Electromagnetic Shielding Attractive and repulsive forces are exerted by electric fields.  Wire mesh shield serves to neutralize these forces.  This is illustrated by means of a charged electroscope inside a cage.
9 Clint
Sprott 8
3:00 Electricity (a) Student in a Faraday cage, (b) Student standing in water connected to a Tesla coil with a metal cap and thimbles on his fingers.  Start at 6:42.
10 I, #8 3:37 Corona Discharge - Lightning Model This demonstrates the physical basis of lightning.  A model recreates the buildup of static charge which results in a cloud-to-ground lightning strike.
11 II, #4 4:25 Parallel Plate Capacitor Here we see the capacitor as an electric device.  It is used to demonstrate the concept of capacitance.  A large working model of a parallel plate capacitor is used to demonstrate the effect of inter-plate distance and the presence of a dielectric between the plates.
12 II, #5 2:46 Energy Stored in a Capacitor A large capacitor (6.1 µF) is charged so that V = 150 volts and the stored energy is converted to gravitational potential energy when a motor attached to the capacitor lifts a mass.
13 II, #6 3:07 Operation of a Battery This demonstrates the use of a lead sulfuric acid battery to ring a small bell. The battery stores energy in chemical form.
14 II, #7 2:30 Temperature and Resistance Two electric circuits consisting of wire coils and small lamps are exposed to temperature extremes.
15 II, #8 3:38 Superconductivity The "floating magnet" behavior resulting from the Meissner Effect is demonstrated followed by the measurement of a zero resistance condition in a bar of superconducting ceramic using a 4-point connection.
16 Paul
Hewitt
5:25 Series and Parallel Circuits This video uses a 12 volt automobile battery, two long vertical posts connected to the positive and negative terminals, and three bulbs that are used in automobiles.  Each bulb has a resistance of 1 ohm so when only one bulb is used, the current through it is i = V/R = 12 volts / 1 ohm = 12 amps.  P = Vi = 144 W.
17 III, #1 2:35 Mapping Magnetic Field Lines Iron filings are used to reveal the field lines of permanent magnets and electromagnets.
18 III, #3 2:48 Forces on an Electron Beam This video demonstrates the behavior of moving electrons when accelerated by a magnetic field.  A low pressure electron tube containing a small amount of inert gas emits a beam of electrons that is bent by a magnetic field.
19 III, #4 2:49 Forces on a Current Carrying Wire Shows how current passing through two parallel wires creates magnetic fields which interact with the electrons flowing in the other wire.
20 III, #6 4:20 Induction of Current This video demonstrates the process of magnetic induction of electric current using both permanent magnets and electromagnets.
21 III, #8 3:40 Eddy Currents:  Force Acting on a Moving Conductor This video demonstrates the formation and interaction of eddy currents with an external magnetic field.  A copper plate mounted on a swinging pendulum stops abruptly when it passes between the poles pieces of an electromagnet.
22 III, #7 3:41 Voltage Transformer Demonstrates a useful application of the physical process of induction.  The components and function of a voltage transformer are examined.
23 PBS 80:00 Tesla, Master of Lightning This video gives long overdue recognition to a great and misunderstood man of science.  The life of Nikola Tesla is an inspiring example of the power of one man to change the world with technology and revolutionary ideas.

Nikola Tesla (1856-1943) was one of the most fascinating scientists of the 20th Century.  He invented, developed or imagined the technology that brought us electricity, remote control, neon and florescent lighting, radio transmission and much more...all the basic inventions that now connect the world with power and information.

He was a brilliant and charismatic immigrant whose talent took him to the height of celebrity.  He locked horns with Thomas Edison, J. Pierpont Morgan, Guglielmo Marconi, and George Westinghouse.  Mark Twain praised his genius.  They are all characters in this video, the very first to tell the full story of Tesla's life and work.

Like many geniuses, Tesla was not a conventional man.  He gave his life to realize his visions, while others made millions with his inventions.  Tragically, he died penniless and nearly forgotten.

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