Inductance
PIRA classification 5J
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.
5J10. Self Inductance
PIRA # |
Demonstration Name |
Abstract |
5J10.10 |
inductor assortment |
Sample inductors are shown. |
5J10.20 |
back EMF - light bulb |
|
5J10.20 |
back EMF |
A 20 Henry inductor energized by a 12 V battery lights a 120 V 7 1/2 W lamp when the circuit is opened. |
5J10.20 |
back EMF |
When current is cut off in the primary, a meter in parallel shows an induction current in the primary. |
5J10.20 |
self inductance |
Open the switch of a large electromagnet with a lamp in parallel. |
5J10.20 |
inductance spark |
Disconnect a 6 V battery from a 2000 turn coil to get a spark, enhance with an iron core. |
5J10.21 |
back EMF |
A 4.5 V battery lights a neon bulb when the current to an inductor is disrupted. |
5J10.22 |
neon back EMF |
The coils of a electromagnet are connected in parallel with a neon bulb. |
5J10.23 |
neon self induction |
A neon lamp across an inductor will glow on one side during charging and will flash on the other when the current is interrupted. |
5J10.25 |
inductance and the wheatstone bridge |
The galvanometer in a Wheatstone bridge is connected after an inductor has reach steady state or at the same time the current is started in the inductor. |
5J10.26 |
simulating ideal self-induction |
A nulling circuit compensates for the steady state current in a coil. |
5J10.30 |
back EMF - spark |
|
5J10.30 |
back emf spark |
A one inch spark is produced when the switch of a large electromagnet is opened. |
5J10.32 |
electromagnetic inertia |
A spark will jump across an almost closed loop of wire rather than go around when attached to a Leyden jar. |
5J20. LR Circuits
PIRA # |
Demonstration Name |
Abstract |
5J20.10 |
RL time constant on scope |
Show the RL time constant on a scope. |
5J20.10 |
LR time constant on scope |
The current and voltage of an slow time constant LR circuit are displayed on a dual trace storage oscilloscope. |
5J20.10 |
L/R time constant |
A plug in circuit board with a make before break switch for showing slow RL time constants on the oscilloscope. |
5J20.10 |
RL time constant |
The RL time constant is shown on a scope. |
5J20.11 |
time constant of an inductive cir. |
Compare the time constant of an inductor using different cores on an oscilloscope. |
5J20.20 |
lamps in series or parallel with ind. |
Hook light bulbs in series with a large electromagnet. |
5J20.20 |
current in an inductive circuit |
Light bulbs across and in series with a large electromagnet show the current in an inductive circuit. |
5J20.20 |
lamps in series and parallel on EM |
Two lamps are used to indicate voltage across and current through a large electromagnet. |
5J20.20 |
series lamps on an EM |
Light bulbs are hooked up in series with a large electromagnet. |
5J20.20 |
lamps in parallel with solenoid |
Apply 110 V to a large solenoid with incandescent and neon lamps in parallel. The neon lamp flashes on the opposite side on discharge. |
5J20.21 |
lights in series and parallel |
A circuit with a 5 H inductor has neon lamps in series and in parallel. |
5J20.25 |
inductor characteristics |
A bulb in parallel with a coil does not burn when powered by dc, but does when coupled to a high frequency source. |
5J20.30 |
LR time constant |
Substitute a inductor and resistor of the same R in a circuit that lights a neon bulb. |
5J30. RLC Circuits-DC
PIRA # |
Demonstration Name |
Abstract |
5J30.10 |
RLC ringing |
The voltages across the L and C of a slow RLC circuit are displayed on a dual trace storage oscilloscope while the circuit is energized and de energized. |
5J30.10 |
characteristic times in a parallel |
Slow parallel RLC ringing on an oscilloscope. |
5J30.10 |
ringing circuit |
Ringing from an RLC circuit is shown on an oscilloscope. |
5J30.10 |
characteristic times in a series RLC |
Slow series RLC ringing on an oscilloscope. |
5J30.10 |
RLC ringing |
A circuit for showing LC ringing on a oscilloscope. |
5J30.11 |
damped LRC oscillation |
Discharge a capacitor through a series LRC circuit. Vary the capacitance and resistance. |
5J30.15 |
RLC ringing |
A motor driven commutator switches a circuit from charging to discharging so RLC ringing decay can be observed on an oscilloscope. Picture, Diagram, Construction details in appendix, p.1334. |
5J30.20 |
RLC ringing |
A DC circuit with RC charging and RLC discharging. |
5J30.21 |
RLC ringing |
A circuit to charge a capacitor either with or without an inductance in series. |
5J30.30 |
singing arc |
A ordinary carbon arc is shunted by a series LC circuit. |