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== DC Circuits ==
''PIRA classification 5F''
||<#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.'''''
= 5F10. Ohm's Law =
||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
|| 5F10.05 || charge density in circuits || Two demonstrations: first, an electroscope is used to probe the charge density along a large resistance attached to a 5 KV supply, and second, an example where current is flowing through a resistance with no change in potential. ||
|| 5F10.10 || Ohm's law || Measure current and voltage in a simple circuit. Change the voltage or resistance. ||
|| 5F10.10 || Ohm's Law || An ammeter, voltmeter, rheostat, and battery pack are connected to demonstrate Ohm's law. ||
|| 5F10.10 || Ohm's law || A battery, rheostat, and meters in a circuit. ||
|| 5F10.10 || Ohm's law || Measure current and voltage in a simple circuit. ||
|| 5F10.10 || Ohm's law || Place 2, 4, and 6 V across a resistor and measure the current, then graph. ||
|| 5F10.12 || water analogy circuit || A water analogy illustrates voltage drops across a dc circuit. ||
|| 5F10.15 || water Ohm's law analog || ||
|| 5F10.15 || water analog || A water analog of Ohm's law. ||
|| 5F10.15 || IR drop in a wire || Clip wires from the terminals of flashlight lamps at various points along a stretched wire carrying 2 - 5 amps. ||
|| 5F10.20 || potential drop along a wire || Lecture galvanometers configured as a voltmeter and ammeter measure current and voltage on several samples of wire of the same length. A slide clip can be used to vary length. ||
|| 5F10.20 || voltage drop along wire || Measure the voltage at six points on a long resistance wire. ||
|| 5F10.25 || potential drop with Wimshurst || A 3 m long wood bar is attached at one end to one terminal of a static machine. The other end can be grounded or insulated. Attach several electroscopes along the bar to show flow of charge and potential drop. ||
|| 5F10.26 || high voltage Ohm's law || Two ends of a dry stick are attached to a static machine. Measure with an electrostatic voltmeter and microammeter. ||
= 5F15. Power and Energy =
||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
|| 5F15.10 || electrical equivalent of heat || Measure the voltage and current to a heating coil in a calorimeter. ||
|| 5F15.10 || heat and electrical energy || A heating coil in a calorimeter. ||
|| 5F15.10 || electrical equvalent of heat || Voltage, current to a heater and temperature rise in water are measured. ||
|| 5F15.10 || electrocalorimeter || Determine the power delivered by temperature change in water and compare to that computed from voltage, current, and time. ||
|| 5F15.11 || flow calorimeter || Water is heated electrically as it flows through a tube. ||
|| 5F15.12 || heating by current from a static mot || The ends of a piece of wood sealed in a glass tube are attached to a static machine. The half watt dissipated heats the air and an attached manometer measures the volume change. ||
|| 5F15.15 || KWH meter and loads || Measure the power consumed by an assortment of household appliances. ||
|| 5F15.16 || heating with current || Large currents are passed through No. 18 nichrome wire and the volts and amps are measured. ||
|| 5F15.17 || heating wires in series || Several lengths of different wires of the same length are soldered together in series and a piece of paper is hung from each by soft wax. As current is passed through the wire, the paper falls off at different times. ||
|| 5F15.20 || hot dog cooker || Hook nails to 110V and place them on and then in a hot dog. ||
|| 5F15.20 || hot dog frying || Apply 110 V through a hot dog and cook it. ||
|| 5F15.30 || fuse with 30v lamp || ||
|| 5F15.31 || fuse-wire problem || With fuse wires of different diameters connected in parallel, which will burn out first? ||
|| 5F15.32 || vaporize wire with 500 amp surge || Short a low voltage high current transformer with zinc coated iron wire. ||
|| 5F15.33 || fuse wire || Fuse wire is used with a miniature house circuit. ||
|| 5F15.34 || fuses || Fuse wire of different sizes are connected across a heavy copper buss. ||
|| 5F15.35 || fuse with increasing load || ||
|| 5F15.40 || voltage drops in house wires || Two resistance wires substituting for house wiring glow when they power a load of lamps and heaters. ||
|| 5F15.45 || I2R losses || Copper and nichrome wires in series show different amounts of heating due to current. A paper rider on the nichrome wire burns. ||
= 5F20. Circuit Analysis =
||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
|| 5F20.10 || Kirchoff's voltage law || Measure the voltages around a three resistor and battery circuit. ||
|| 5F20.10 || Kirchoff's voltage law || Measure the voltages around a three resistor and battery circuit. ||
|| 5F20.10 || sum of IR drops || Measure the voltages across three resistors and a battery in a series circuit. ||
|| 5F20.13 || voltage divider || A simple series circuit of a battery and two resistors. ||
|| 5F20.15 || continuity of current || Same as Eo-4. ||
|| 5F20.15 || continuity of current || An ammeter can be inserted into any branch of a circuit to show currents in and out of a node. ||
|| 5F20.16 || conservation of current || Measure the currents entering and leaving a node. ||
|| 5F20.20 || superposition of current || Same as Eo-7. ||
|| 5F20.20 || superposition of currents || Measure the current from one battery, a second in another position, and the combination in a circuit. ||
|| 5F20.20 || superposition || Shows a standard superposition circuit. ||
|| 5F20.25 || reciprocity || Shows a standard reciprocity circuit. ||
|| 5F20.30 || potentiometer || A slide wire potentiometer is used with a battery and demonstration galvanometer. ||
|| 5F20.30 || potentiometer || A slide wire potentiometer with a standard cell. ||
|| 5F20.31 || rheostat as potential divider || Contrast the slide wire rheostat when used as a rheostat or potential divider. ||
|| 5F20.32 || long potentiometer || Use a ten foot length of nichrome wire as a slide wire potentiometer. ||
|| 5F20.33 || rheostat potential divider || A rheostat and six volt battery demonstrate a potential divider. ||
|| 5F20.40 || wheatstone bridge - slide wire || The slide wire Wheatstone bridge. ||
|| 5F20.40 || wheatstone bridge - slide wire || Two nichrome wires are stretched across the lecture bench and sliding clips connected to a galvanometer are used to find equal potential points. ||
|| 5F20.41 || wheatstone bridge - human galvan. || Stretch a loop of close line previously soaked in salt solution in a parallelogram and hook the ends to a 110 V line. Touch two points of the same potential without shock. ||
|| 5F20.42 || wheatstone bridge || A demonstration Wheatstone bridge with a built in meter and several plug in resistors. ||
|| 5F20.45 || lightbulb wheatstone bridge || A Wheatstone bridge configuration with lightbulbs for resistors. ||
|| 5F20.45 || light bulb wheatstone bridge || Four light bulbs in a Wheatstone bridge arrangement with light bulb indicator. ||
|| 5F20.45 || light bulb wheatstone bridge || A light bulb Wheatstone bridge using 110 ac. ||
|| 5F20.45 || wheatstone bridge || Four 60 W lamps in a diamond bridge with a 10 W lamp as the indicator. An additional 6 V lamp can be switched in when the circuit is balanced. ||
|| 5F20.45 || wheatstone bridge || Three 110 V lamps and a rheostat make up the diamond of a Wheatstone bridge and a small lamp serves as an indicator. ||
|| 5F20.50 || series and parallel light bulbs || A light bulb board with switches allows configuration of several combinations of series and parallel lamps. ||
|| 5F20.50 || series and parallel light bulbs || A light bulb board with switches allows configuration of several combinations. ||
|| 5F20.50 || parallel and series light bulbs || Three similar wattage lamps in series, three in parallel. ||
|| 5F20.50 || series-parallel circuits || A series-parallel circuit with three bulbs and six switches can be connected 14 ways. ||
|| 5F20.50 || series/parallel light bulbs || Three 110 V lamps are wired in series and three are wired in parallel. ||
|| 5F20.51 || light bulb board - 12 V || A board with 12V bulbs and a car battery allow combinations of up to three series or three parallel loads. ||
|| 5F20.55 || series/parallel resistors || Measure the current flowing through a wire resistor with 6 V applied and then series and parallel combinations. ||
|| 5F20.56 || wire combinations || A wire circuit is arranged so a segment of n length can have 1 or n wires in parallel. Drawing. ||
|| 5F20.60 || equivalent series resistance || A series of resistors in a circuit are replaced by a single resistor. ||
|| 5F20.61 || parallel resistance - integral value || A formula for obtaining integral values of resistors in parallel to obtain an integral equivalent resistance. ||
|| 5F20.61 || equivalent parallel resistance || Parallel resistors are replaced by a single resistor in a circuit. ||
|| 5F20.63 || Thevenin's equivalent resistance || A Wheatstone bridge resistance circuit is used to reduce resistor combinations to an equivalent resistance. ||
|| 5F20.64 || equivalent circuit flasher || A neon flasher circuit shows the combination rules for series and parallel combinations of resistance and capacitance by timing light flashes. ||
|| 5F20.71 || large circuit boards || A modular circuit board made for 500 student auditoriums. ||
|| 5F20.72 || general circuits board || A circuit board laid out so meters can be plugged in and readings taken for demonstrations of series-parallel circuits and Kirchhoff's laws. ||
|| 5F20.75 || three-way switch || A large circuit board demonstrates a three way switch. ||
|| 5F20.79 || one boar, river, six people || An electrical circuit for solving the problem of getting across the river. ||
|| 5F20.95 || equivalent resistance analog comput. || Using the equivalent resistance of a circuit as an analog computer for finding the focal length of an optical problem. ||
= 5F30. RC Circuits =
||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
|| 5F30.10 || capacitor and light bulb || A large lelectrolytic capacitor, a light bulb, and a 120 V dc supply in series show a long time constant. ||
|| 5F30.10 || capacitor and light bulb || A 5600 microF capacitor is charged and discharged through 7.5 and 40 W light bulbs. ||
|| 5F30.10 || long RC time constant || A 5600 microF capacitor, a light bulb, and a 120 V dc supply in series show a long time constant where the bulb dims as the capacitor charges. ||
|| 5F30.11 || light the bulb || Charge a capacitor with DC and discharge through a light bulb, try the same thing with AC. ||
|| 5F30.12 || discharge a capacitor || Discharge a capacitor through a resistor. Read the voltage with a meter. ||
|| 5F30.15 || RC time constant on galvanometer || A series RC circuit with a galvanometer. Diagram. ||
|| 5F30.16 || RC voltage follower || Use a voltage follower to isolate the circuit from the display. ||
|| 5F30.20 || RC time constant on scope || A circuit with a slow time constant (.1 - 10 sec.) is charged and discharged and the current and voltage are displayed on a dual trace storage scope. ||
|| 5F30.20 || RC charging curve || Show charging and discharging a RC circuit with a battery on an oscilloscope. ||
|| 5F30.21 || RC time constant || Show the time constant from an RC circuit on an oscilloscope. ||
|| 5F30.21 || RC time constant || A plug in circuit board for showing RC time constants on the oscilloscope. ||
|| 5F30.22 || time constant of an capacitive cir. || The time constant of a RC circuit driven by the calibration signal is shown on an oscilloscope. ||
|| 5F30.28 || finding R from time constant || A circuit to measure high resistances by using an RC charging time. ||
|| 5F30.50 || series and parallel capacitors || Two 2 microF capacitors in series or parallel with a 40 W lamp. ||
|| 5F30.60 || neon relaxation oscillator || ||
|| 5F30.60 || blinking neon bulb || A neon bulb in parallel with a capacitor will light periodically as the capacitor charges and discharges. ||
|| 5F30.60 || RC relaxation oscillator || An RC relaxation oscillator has a neon lamp across the capacitor provide a visible discharge. ||
|| 5F30.60 || RC flasher circuit || A neon lamp in parallel with the capacitor in a series RC circuit. ||
|| 5F30.60 || flashing neon light || A battery powered neon light oscillator. ||
|| 5F30.60 || neon relaxation oscillator || A circuit for a neon relaxation oscillation oscillator. Reference: AJP 13(12),415. ||
|| 5F30.60 || relaxation oscillator || An RC neon light relaxation oscillator. ||
|| 5F30.61 || relaxation siren oscillator || A double RC relaxation oscillator with slow and fast periods gives a siren waveform. ||
|| 5F30.68 || backward and forward waves || RC circuits are used to get a wave in neon bulbs that goes from the sink to the source. ||
|| 5F30.71 || capacitance operated relay || References but no information on the circuit. Bring your hand close to a aluminum plate and the relay triggers. ||
|| 5F30.80 || fun circuit || One box has switches that control two lights in another box but only one wire connects the two boxes. ||
= 5F40. Instruments =
||<:10%>'''PIRA #'''||<:>'''Demonstration Name'''||<:60%>'''Abstract'''||
|| 5F40.10 || sensitivity and resistance of a galv || A circuit for the determination of galvanometric constants. ||
|| 5F40.10 || sensitivity and resistance of galvan || Use external resistors to measure the resistance and sensitivity of a galvanometer. ||
|| 5F40.15 || voltmeter and electroscope || Connect series resistance to a galvanometer to make a voltmeter with low sensitivity and measure several dry batteries in series with both the voltmeter and an electroscope. ||
|| 5F40.20 || converting a galvanometer to a voltm || Knowing the resistance and sensitivity of a galvanometer, add a series resistance and check with a voltage. ||
|| 5F40.20 || galvanometer as voltmeter and ammete || A galvanometer is used with shunt and series resistors. ||
|| 5F40.21 || loading by a voltmeter || Measure the voltage across a high resistance circuit with high and low impedance voltmeters. ||
|| 5F40.25 || converting a galvanometer to a ammet || Knowing the resistance and sensitivity of a galvanometer, add a shunt resistance and measure a current. ||
|| 5F40.30 || hot wire ammeter || A crude hot wire galvanometer. ||
|| 5F40.30 || hot wire ammeter || Diagram of a hot wire ammeter. (E-171). ||
|| 5F40.35 || iron vane meter || Repulsion from induced magnetism in two soft iron bars in a solenoid forms the basis of a heavy current ammeter. ||
|| 5F40.50 || multimeters || A couple multimeters are pictured. ||
[[Demonstrations]]
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