#acl Narf:read,write,delete,revert,admin FacultyGroup:read,write All:read == Resistance == ''PIRA classification 5D'' ||<#dddddd>Grayed Demos are either not available or haven't been built yet || ''''' Please note that these tables have not yet been edited to match the equipment that is available within the UW-Madison lecture demo lab. There maybe many items listed within these tables that we either "can not do" or have available.''''' = Resistance Characteristics = ||<10% style="text-align:center">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets'''||<60% style="text-align:center">'''Abstract''' || ||5D10.10 ||resistor assortment || || || ||5D10.11 ||scaled up resistor box || ||Rebuild an old resistance box with larger numbers. || ||5D10.20 ||characteristic resistances || ||Connect one meter lengths of various wires in series and measure the voltage across each. || ||5D10.20 ||characteristic resistance || ||Measure voltages on a commercial board with seven one meter lengths of various wires is series so all carry the same current. || ||5D10.20 ||resistance wires || ||Place 6V across a set of wires of different lengths and/or diameters and measure the currents. || ||5D10.22 ||resistance characteristic of arc || ||Measure the current and potential across a small arc as the series resistance is varied. || ||5D10.40 ||resistance model || ||Balls are rolled down an incline with pegs. || ||5D10.40 ||model of resistance ||pira200||A ball is rolled down a board with randomly spaced nails. || ||5D10.40 ||charge motion demonstrator || ||Small balls are rolled down a board with nails scattered in an almost random pattern. Diagram. || ||5D10.40 ||electron motion model || ||Ball bearings are simultaneously rolled down two ramps, one with pegs and one without. || ||5D10.50 ||current model with Wimshurst || || || = Resistivity and Temperature = ||<10% style="text-align:center">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets'''||<60% style="text-align:center">'''Abstract''' || ||5D20.10 ||wire coil in liquid nitrogen ||pira200||A lamp glows brighter when a series resistance coil is immersed in liquid nitrogen. || ||5D20.10 ||resistance at low temperature || ||A lamp glows brighter when a series resistance coil is immersed in liquid air. || ||5D20.10 ||cooled wire || ||A copper coil in series with a battery and lamp is immersed in liquid nitrogen. || ||5D20.11 ||resistance at low temperature || ||A "C" battery, 3 V flashlight bulb, and a copper wire coil make a hand held temp coefficient of resistivity apparatus. || ||5D20.12 ||audible temp-dependent resistance || ||The resistor plunged into liquid nitrogen is part of a voltage controlled oscillator that drives a speaker. || ||5D20.12 ||cooling || ||Current is increased in a long U of iron wire until it glows, then half is inserted into a beaker of water. || ||5D20.14 ||superconducting wire || ||Cool a coil of NbTi wire in a series circuit with a 12 volt car battery and lamp first in liquid nitrogen, then helium. The voltage across the coil is monitored and the lamp brightness is observed. || ||5D20.15 ||flame and liquid nitrogen || ||Resistance coils are heated and cooled with a test light bulb in series. || ||5D20.15 ||temperature dependence of resistance || ||Two sets of bulbs in series with coils, one put in liquid nitrogen and the other in a flame. || ||5D20.16 ||temperature coefficent of resistance || ||Two coils of different material but the same resistance are placed in a Wheatstone bridge and either is heated or cooled. || ||5D20.20 ||iron wire in flame || ||Heat a coil of iron wire in series with a battery and a lamp and the lamp will dim. || ||5D20.20 ||iron wire in a flame || ||A coil of forty turns of iron wire is heated in a flame while connected in series with a light bulb circuit. || ||5D20.20 ||putting the light out by heat || ||A coil of iron wire wound on a porcelain core in series with a lamp and battery is heated until the lamp goes out. || ||5D20.20 ||heated wire || ||Heat a coil of iron wire in series with a battery and a lamp. || ||5D20.21 ||flame || ||A coil of nickel wire connected to a battery and galvanometer is heated in a flame. || ||5D20.30 ||pos and neg resistance coefficients || ||Measure current and resistance at various voltages for a carbon and tungsten bulb. || ||5D20.30 ||carbon and tungsten lamps || ||Plot current vs. voltage for carbon and tungsten lamps. || ||5D20.31 ||resistance of light bulbs || ||The V/I curves for tungsten and carbon filament lamps are shown on a dual trace storage oscilloscope. || ||5D20.32 ||temperature of incandescent lamps || ||Two silicon solar cells with interference filters measure the light at different wavelengths for use in determining the temperature of the filament. || ||5D20.40 ||resistance thermometer || ||Attach No. 14 copper leads to a platinum coil and use with a Wheatstone bridge. || ||5D20.50 ||thermistors || ||Use a good kit of commercial thermistors and display the differential negative resistance of a fast thermistor on a transistor curve tracer. || ||5D20.50 ||thermistor || ||Show the resistance of a thermistor placed in an ice water bath. || ||5D20.60 ||conduction in glass at high temp || ||A simple version of glass conduction using binder clips and window glass. || ||5D20.60 ||conduction in glass at high temp || ||Heat a capillary tube in a Bunsen burner until it is hot enough to sustain a current that maintains a bright glow. || ||5D20.60 ||conduction in glass ||pira200||Two light bulbs are connected in series to a power supply. One of the ligh bulbs is smashed with a mallet and the filaments is cut off. Then, the glass stem is heated with a blow torch. || ||5D20.61 ||negative temp coeff of resistance || ||A Nerst glower must be heated with a flame until the resistance is low enough to sustain electrical heating. || = Conduction in Solution = ||<10% style="text-align:center">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets'''||<60% style="text-align:center">'''Abstract''' || ||5D30.10 ||conductivity of solutions || ||Dip two metal electrodes in series with a light bulb in various solutions. || ||5D30.10 ||conduction thru electrolytes || ||Immerse two copper plates in series with a lamp in distilled water, add barium hydroxide, then sulfuric acid. || ||5D30.10 ||conduction thru electrolytes || ||Put two copper plates in series with a lamp in distilled water and salt or acid is added. || ||5D30.10 ||conductivity of solutions || ||Two electrodes in series with a 110 V lamp are dipped into distilled water, salt water, a sugar solution, a vinegar solution, and tap water. || ||5D30.13 ||salt water string || || || ||5D30.15 ||electrolytic conduction on chamios || ||Suspend a chamois between ringstands, show no conduction with a battery, resistor, meter. Soak in distilled water, repeat, then sprinkle on salt || ||5D30.20 ||speed of ions || ||Show KMnO4 migrating with current towards the positive electrode in KNO3. || ||5D30.20 ||migration of ions || ||Permanganate ions migrate in an electric field. || ||5D30.21 ||ionic speed || ||Dip two platinum electrodes into an ammoniated copper sulfate solution containing some phenophthalein. || ||5D30.22 ||ionic speed || ||Blue moves from the anode of in a potassium chloride gel when 120 volts is applied. || ||5D30.23 ||ionic speed || ||Measuring the speed of hydrogen and hydroxyl ions in a potassium chloride gel. || ||5D30.30 ||pickle glow || || || = Conduction in Gases = ||<10% style="text-align:center">'''PIRA #''' ||'''Demonstration Name''' ||'''Subsets'''||<60% style="text-align:center">'''Abstract''' || ||5D40.10 ||Jacob's ladder ||pira200||A arc rises between rabbit ear electrodes attached to a high voltage transformer. || ||5D40.20 ||conduction of gaseous ions || ||A nearby flame will discharge an electroscope. || ||5D40.21 ||discharge with flame || ||A flame connected to a high voltage source is inserted between charged parallel plates. || ||5D40.25 ||blowing ions by a charged plate || ||Compressed air blows ions from a flame through the area between charged parallel plates onto a mesh hooked to an electrometer. || ||5D40.25 ||discharge by ions in a tube || ||Electrodes at the bottom, middle, and top of a tube are connected to an electrometer while a Bunsen flame is burned at the bottom. || ||5D40.27 ||recombination of ions || ||Ions from a flame are drawn past a series of charged plates attached to a Zeleny electroscope. || ||5D40.28 ||separating ions from flame || ||Shadow project a flame between two charged metal plates to observe separation of gas into two streams of oppositely charged ions. || ||5D40.30 ||ionization by radioactivity || ||Discharge an electroscope with a radioactive source. || ||5D40.32 ||ionization in air || ||Various sources of ionization are brought near parallel wires attached to a 100 V battery and a Zeleny electroscope. || ||5D40.33 ||saturation || ||The voltage across a plate close to a wire mesh is increased with a radioactive source nearby and the current is observed with a Zeleny electroscope. || ||5D40.34 ||ion mobilities || ||A second mesh is inserted into the apparatus of A-2 and an alternating potential increased until the electroscope oscillates. || ||5D40.35 ||conduction in air by ions || ||An electrometer measures the current between parallel plates as a flame is burned between them or an alpha source is held nearby. || ||5D40.36 ||Cerberus smoke detector || ||Combustion products decrease conductivity in a chamber with an alpha source. || ||5D40.40 ||conduction from hot wire || ||A constantan wire held near a charged electroscope causes discharge when it is heated red hot. || ||5D40.41 ||thermionic effect in air || ||A Zeleny electroscope indicates electron emission from a wire when it is heated. || ||5D40.42 ||thermionic emission || ||A commercial tube. Apply 90 V forward and reverse and monitor the current. || ||5D40.50 ||neon bulb resistivity || ||A neon lamp lights at about 80 V and shuts off at about 60 V. || ||5D40.80 ||ionization by X-rays || ||Discharge an electroscope with X-rays. || ||5D40.80 ||x-ray ionization || ||Discharge an electroscope with x-rays. || ||5D40.81 ||ionization by X-rays || ||An X-ray beam is passed through a simple ionization chamber. || ||5D40.99 ||electrohydrodynamics || ||read this again - practical examples are ink jet printing and electrically driven convection. || [[Demonstrations]] [[Instructional|Home]]