Combined display of all available logs of UO Physics Demonstration Catalog. You can narrow down the view by selecting a log type, the username (case-sensitive), or the affected page (also case-sensitive).

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• 12:48, 20 April 2022 Physdemo talk contribs created page Back EMF (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Inductance|file1=Backemf.gif}} A current is run through a coil, which in turn is hooked up to an oscilloscope. A 330 ohm resistor is placed between the positive and negative terminals of the coil. With the oscilloscope in storage mode, a sharp negative peak can be seen to coincide with a spark when one of the banana plugs is pulled from the power supply. '''Location: ''' * Coil from transformer: Shelf J-3 * 6/12 Volt Po...")
• 12:48, 20 April 2022 Physdemo talk contribs created page Transformers (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Inductance|file1=Transformers.gif}} Demonstration transformers made by coupling coils of various turns together with laminated iron bars. Step down or step up transformers can be put together. Meters connected to the primary and secondary measure the voltage. Ratios of voltages are compared to the turns ratio. Results are close. Hysteresis and eddy current losses can be discussed. '''Location: ''' * Coils: Shelf J-3 * T...")
• 12:47, 20 April 2022 Physdemo talk contribs created page Induction Coils (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Inductance|file1=induction leds 1.jpg|file2=induction leds 2.jpg}} A large coil connected to a galvanometer. Currents are induced by moving a bar magnet in and out or through the coil. Also available to show this concept is a smaller coil connected to some LEDs. Move the magnet through the coil quickly to make the LEDs light up. '''Location: ''' * Coil Shelf J-3 * Bar Magnet: DR 71 * Galvanometer: DR 83 * Small coil &...")
• 12:46, 20 April 2022 Physdemo talk contribs created page Jumping Rings (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Inductance|file1=Jumping Rings.gif}} An AC solenoid with a moveable iron core. Turn the current on with the ring around the core to send it flying. There are heavy and light rings available and one which is cut to show the importance of the induced current in the ring. There is also a small coil with a light bulb to show the presence of this current. '''Location: ''' * Solenoid: Shelf J-3 * Accessories: Drawer 74")
• 12:45, 20 April 2022 Physdemo talk contribs created page Induced Currents (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Inductance|file1=Induction Coil.gif}} A linear motor salvaged from an old hard drive is the heart of this demo. Attach a small bulb to the leads of the coil and it will light when the coil is moved up and down in the strong magnetic field. Attach a battery to the leads and the coil will climb out of its holder. Attaching an oscilloscope to the leads shows the direct relation between induced EMF and changing flux -- both...")
• 12:42, 20 April 2022 Physdemo talk contribs created page Magnetic Deflection of Electron Beam (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Magnetic.gif}} The beam from an electron gun can be deflected by the field of a set of Helmholtz coils or by a bar magnet. The beam is intercepted by the phosphor coated sheet (with grid) which glows to show the path of the beam. Click here for a wiring diagram [<-- Broken image, needs replacing]. '''Location: ''' * Shelf L-2 *")
• 12:40, 20 April 2022 Physdemo talk contribs created page E/m tube--circular e-beam (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=em tube-circular e beam.gif}} '''Location: ''' * Tube: Shelf L-2 * Power Supply: Shelf K-3")
• 12:39, 20 April 2022 Physdemo talk contribs created page Generator--Alternator (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Generator--Alternator.gif}} An automobile alternator is driven by hand through a set of pulley's. The magnetic field within the alternator can be self induced or can be induced by an external voltage supply. The output of the alternator is connected to a set of three 12 V light bulbs each of which can be independently turned off or on. As the generator is turned to the point of lighting o...")
• 12:37, 20 April 2022 Physdemo talk contribs created page Motor and Generator--Same Device (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Motor and Gen Same Device.gif}} By turning the bicycle wheel, the generator causes the light to turn on. By then applying 5-V AC to the generator, it becomes a motor which can turn the wheel. Because the generator was not designed for this use it takes a little encouragement to turn the wheel. The wheel must be turned by hand at the right speed (less than one rev. per second) in the clock...")
• 12:23, 20 April 2022 Physdemo talk contribs created page Hall Effect (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=}} Hall effect materials ( Bismuth and Germanium) are available. A hall effect probe (in the form of the MBL Force Probe) is also available. With this probe connected to the computer you can plot the strength of a magnetic field. Sensitive enough to show the earth's magnetic field and demonstrate the field is uniform between a set of Helmholtz Coils. A Thorton hall probe connected to a mi...")
• 12:23, 20 April 2022 Physdemo talk contribs created page Magnetic Field Detector (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=}} '''Location:''' *")
• 12:22, 20 April 2022 Physdemo talk contribs created page Current Balance (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Current Balance.gif}} For precise mass measurement or for showing the interaction of current in parallel wires. Parallel or anti-parallel currents can be set up in the two parallel rods. A laser bouncing off of a mirror onto a wall shows very small movements of the upper rod and magnetic dampening helps to limit oscillation. Click here for wiring diagram [BROKEN IMAGE, needs replacing]....")
• 12:21, 20 April 2022 Physdemo talk contribs created page Flip Coil (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Flip Coil.gif}} For measuring the strength of the earth's magnetic field. A coil is flipped by a spring. An oscilloscope records the current produced. '''Location: ''' * Flip Coil: Shelf J-4 * Oscilloscope: Black Cabinet")
• 12:20, 20 April 2022 Physdemo talk contribs created page Solenoids (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=}} A variety of coils are available. '''Location: ''' * Shelf J-4")
• 12:20, 20 April 2022 Physdemo talk contribs created page Electric Motor (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=}} A variety of motors, from permanent magnet to powered coils, can be used to show the effects of electromagnetic forces. Most of these allow easy viewing of the parts. '''Location: ''' * Shelf J4 * Drawer 75")
• 12:20, 20 April 2022 Physdemo talk contribs created page Torsion Balance (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Torsion Balance.gif}} Use this to show the magnetic field created by a current carrying coil. Mount a permanent horseshoe magnet next to the coil or use solenoids to produce an external field. Apply a small current through the coil and the field of the coil will try to align with the external field but is opposed by the torsion wires supporting the coil. A laser beam bounced off of the mi...")
• 12:19, 20 April 2022 Physdemo talk contribs moved page Electromagnet--nail and battery to Electromagnet: Nail and Battery
• 12:18, 20 April 2022 Physdemo talk contribs created page File:Electromagnet.jpeg
• 12:18, 20 April 2022 Physdemo talk contribs uploaded File:Electromagnet.jpeg
• 12:17, 20 April 2022 Physdemo talk contribs created page Electromagnet--nail and battery (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=electromagnet.jpg}} A very simple electromagnet. Double check settings before turning on. '''Location: ''' * Power supply - K2 * Coil/Magnet - 73 * Nails - J4")
• 12:16, 20 April 2022 Physdemo talk contribs created page Jumping Wire (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Jumping Wire.gif|file2=jumping speaker.gif}} String a wire between the poles of the large magnet and connect the ends to a power supply. Turn on a small current through the wire and it will jump out. Reverse the polarity and the wire will jump into the magnet. Also available as a variation on this concept is the "jumping speaker" demo. There are a couple speakers in drawer 43 that look li...")
• 12:15, 20 April 2022 Physdemo talk contribs created page Field of Magnetic Dipole (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Fields and Forces|file1=Field of Magnetic Dipole.gif}} A small plastic box with metal filings suspended in oil. There is a central cavity to receive a round bar magnet. Shake the box to disperse the filings and insert the magnet. The filings will quickly align to the field. Works on the overhead. '''Location: ''' * Shelf J-4 *")
• 12:13, 20 April 2022 Physdemo talk contribs created page Hysteresis (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Materials|file1=Hysteresis.gif}} This demo is used to show the hysteresis curve of iron in a transformer core by plotting B vs H on an oscilloscope. The magnetic induction B is plotted on the vertical axis and the applied field H on the horizontal. The value of H is obtained by using the voltage across a 1 ohm rheostat in series with the primary coil of the transformer. The secondary winding of the transformer p...")
• 12:12, 20 April 2022 Physdemo talk contribs created page Dip needle (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Materials|file1=Dip Needle.gif}} A magnetic compass mounted in a vertical plane. Displays the angle of inclination of the earth's magnetic field '''Location: ''' * Shelf J-4")
• 12:12, 20 April 2022 Physdemo talk contribs created page Magnets (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Magnetic Materials|file1=}} A variety of magnets are available. '''Location: ''' * Disc and Bar Magnets: Drawer 71 * Horseshoe Magnets: Drawer 72")
• 12:11, 20 April 2022 Physdemo talk contribs created page Superconductor (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Superconduction|file1=}} A superconductor is cooled with liquid nitrogen and a small rectangular magnet is placed on it. When the superconductor reaches its critical temperature, and begins to superconduct, the magnet will begin to float above the surface. A video camera can be placed on the floating magnet and the image can be projected so it is more visible. This demo looks especially good when the magnet is made to ro...")
• 12:03, 20 April 2022 Physdemo talk contribs created page EM Radiation: Radio and Tesla Coil (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Electromagnetic Radiation|file1=}} A Tesla coil is used to produce EM radiation (noise). A battery operated transistor AM radio is placed at the other end of the room to pick up the noise generated by the coil. '''Location: ''' * Tesla Coil: Drawer 73 * Transistor Radio: Shelf K-4")
• 12:03, 20 April 2022 Physdemo talk contribs created page Crystal Radio (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Electromagnetic Radiation|file1=}} A Tesla coil is used to produce EM radiation (noise). A battery operated transistor AM radio is placed at the other end of the room to pick up the noise generated by the coil. '''Location: ''' * Tesla Coil: Drawer 73 * Transistor Radio: Shelf K-4")
• 11:57, 20 April 2022 Physdemo talk contribs created page RC--Light Bulb and Capacitor (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Circuits|file1=}} There are two ways to do this demonstration. One is using a high-voltage power supply of around 120 volts connected to a 10-20 thousand micro-farad capacitor. The power supply is used to charge the capacitor. When the capacitor is fully charged, a light bulb is placed across it. The bulb starts out bright, and then dims. The other way to do this is to use low-voltage light bulbs such as flashlight bulbs...")
• 11:57, 20 April 2022 Physdemo talk contribs created page LRC Series Resonance (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Circuits|file1=LRC Series Resonance.gif}} An inductor, resistor, and capacitor are connected in series. One can either monitor the voltage across the capacitor or the voltage across the resistor as the frequency is varied and resonance is reached. '''Location:''' *")
• 11:56, 20 April 2022 Physdemo talk contribs created page LRC Visual Demo (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Circuits|file1=}} A 200-watt light bulb is in series with a variable inductor and a fixed capacitance. As the inductance is changed, by lowering an iron core, the lightbulb reaches a maximum brightness. '''Location:''' *")
• 11:56, 20 April 2022 Physdemo talk contribs created page LR & RC Phase Relations (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Circuits|file1=LR & RC Phase Relations.gif}} An inductor or a capacitor is in series with a resistor. By switching in the inductor or the capacitor, the change in phase relationships of voltage and current can be observed. '''Location:''' *")
• 11:12, 20 April 2022 Physdemo talk contribs created page Theremin (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Capacitance|file1=Theremin.jpg}} Moving a hand closer to the horizontal bar decreases the amplitude. Moving your hand closer to the vertical antenna will increase the pitch. Volume can be adjusted with the knob on the front of the theremin and on the amplifier. The antenna as a theremin acts as one plate of a parallel plate capacitor, and your hand acts as the second. This demo can also be attached to the flame tube. ''...")
• 11:11, 20 April 2022 Physdemo talk contribs created page Capacitor: Storage of Charge (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Capacitance|file1=}} Two 5000 microfarad capacitors connected and acharged to ~80 Volts. They will hold their charge until discharged with a screwdriver. This produces a spark and a very loud "pop". '''Location: ''' * Drawer 89")
• 11:11, 20 April 2022 Physdemo talk contribs created page Parallel Plate Capacitors 2 (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Capacitance|file1=Parallel Plate Capacitors 2.gif}} Two half circle plates that can be adjusted to change the area of the capacitor. Also available are multiple plate radio tuners of the same design type. '''Location: ''' * Plates: Shelf I-2 * Radio tuners: Drawer 89")
• 11:11, 20 April 2022 Physdemo talk contribs created page Parallel Plate Capacitors (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Capacitance|file1=Parallel Plate Capacitors.gif}} Large (20 cm.) plates mounted to allow any separation distance from 1 to 120 mm. (includes indicator scale). Capacitance from 2.3 to 280 pF. The capacitor is connected to an Electrometer and then charged with a battery. Slowly moving away one of the p lates decreases the capacitance and the voltage measured by the Electrometer will increase. A piece of plexiglass can be u...")
• 11:10, 20 April 2022 Physdemo talk contribs created page Leydon Jars (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Capacitance|file1=Leydon Jars.gif}} Old glass jar with foil on the inside and outside. A very basic and visual capacitor. '''Location: ''' * Shelf I-2 *")
• 11:08, 20 April 2022 Physdemo talk contribs created page Human Conductor Circuit (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=Human Conductor.jpg}} A safety bulb is lit up when a conductive path connects the two leads. Works with upwards of 20 people. Brightness can vary with resistance and quality of contact to double as a good demonstration of resistance as well as conduction. You might also wet your hands and touch the leads to show a sudden decrease in resistance. Inserting a metal rod, a plastic rod, and...")
• 11:08, 20 April 2022 Physdemo talk contribs created page Parallel Circuits: Large Rheostats (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} Two large rheostats are hooked in parallel with large meters or overhead meters. '''Location: ''' * Rheostats: Drawer 79 * Large meters: Shelf K-2 * Overhead Meters: Drawer 83 * Power Supplies: Shelf K-3") Tag: Visual edit: Switched
• 11:06, 20 April 2022 Physdemo talk contribs moved page Series Circuit:LargeRheostats to Series Circuit: Large Rheostats without leaving a redirect
• 11:06, 20 April 2022 Physdemo talk contribs created page Series Circuit:LargeRheostats (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} Two large rheostats are hooked in series with large meters or overhead meters. '''Location: ''' * Rheostats: Drawer 79 * Large meters: Shelf K-2 * Overhead Meters: Drawer 83 * Power Supplies: Shelf K-3")
• 11:06, 20 April 2022 Physdemo talk contribs created page Fuse Demo (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} Three light bulbs are hooked up in parallel with a piece of nichrome wire as a fuse in series with the bulbs. When the fuse burns up all the bulbs go out. '''Location: ''' * Sockets: Shelf K-2 * Fuse wire: Shelf K-2")
• 11:06, 20 April 2022 Physdemo talk contribs created page Parallel Circuit with Light Bulbs (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} Two or three light bulbs are hooked in parallel. Unscrewing any one of the light bulbs has no effect on the other ones. Bulbs of different wattage can be used showing the dependance of current and power. '''Location: ''' * Light Bulbs: Drawer 113 * Light Bulb Sockets: Shelf K-2")
• 11:05, 20 April 2022 Physdemo talk contribs created page Series Circuit with Light Bulbs (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} Two light bulbs are hooked in series. A third light bulb is connected directly to a variac (120v). The two series bulbs are half as bright and when the variac is adjusted to the brightness of the series bulbs it is at 50%. When a 75w bulb and a 25w bulb are connected in series only the 25w bulb lights up because it has a higher resistance and therefore most of the available voltage i...")
• 11:05, 20 April 2022 Physdemo talk contribs created page Current Analogy--water flow (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=Current Analog-water flow.gif}} A large jug filled with water is drained by two tubes. One has a significantly larger diameter than the other. The pressure (analogous to electric potential) is the same for both tubes. The larger diameter tube allows more water to flow (small resistance) than the small diameter tube (large resistance). '''Location: ''' * Large Water Container: Shelf T-2...")
• 11:04, 20 April 2022 Physdemo talk contribs created page Current Analogy--marble and pins (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=Marble and pins analogy.gif}} A marble falls through obstacles. '''Location: ''' * Shelf J-1 *")
• 11:03, 20 April 2022 Physdemo talk contribs created page Current: Transfer of Charge (Visible Resistor) (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=VisibleResistor.gif}} The parallel-plate capacitor is connected to a high-voltage power supply with the electrometer connected in series to monitor the current (10 microamps). A ping-pong ball covered with conductive paint dangles between the two plates. When the power supply is turned on, the ball oscillates between the two plates, transferring charge. The higher the voltage or the clo...")
• 11:03, 20 April 2022 Physdemo talk contribs created page Piezoelectricity (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} A trigger puts pressure on a crystal that produces a high potential causing a spark. '''Location: ''' * Drawer 57 or 82")
• 11:02, 20 April 2022 Physdemo talk contribs created page Thermocouple (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} Two different metal wires such as Chromel and Constantan ( Type E) are twisted together at each end. One wire is cut in the middle and a volt meter is placed to measure the potential difference which is produced by sticking each end into a bath of different temperatures such as ice water and boiling water '''Location: ''' * Drawer 57 or 82 *")
• 11:02, 20 April 2022 Physdemo talk contribs created page Lemon Battery (Created page with "{{NewDemo|subject=Electricity and Magnetism|topic=Resistance, EMF, and Current|file1=}} Zinc plated nails and copper wires are inserted into a lemon and a voltage is produced. Voltage can be measured or five lemon batteries can be hooked in series and connected to a capacitor. Ignite a flash cube with the voltage stored in the capacitor '''Location: ''' * Drawer 69")

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