Demonstrations

Identifier Title Summary
E&M: C - 001 Copper and Chromel Wire Segments

A strand of wire composed of differing materials (Cu and NiCr) demonstrates how the amount of heat produced differs with resistance.

Apparatus consisting of a strand of different segments of wire
E&M: C - 002 Electric Lamps in Series and in Parallel

Two light bulbs of differing wattage are connected in series and in parallel with the AC outlet.

Two lightbulbs, a switch, and 4 wires rest on a table top
E&M: C - 003 Model Transmission Line
E&M: C - 005 Lamp with Heat

The wires providing power to a light bulb are heated.  As a result, the light bulb gets dimmer.

Light bulb with wires on ring stand, bunsen burner, striker
E&M: C - 007 Homemade Battery to Light Lightbulb
E&M: C - 008 Electrocute a Pickle

A pickle is electrocuted using current from a standard wall outlet.

A pickle is connected to an AC switch
E&M: C - 009 Voltaic EMF of an Electrolyte
E&M: C - 012 Discharge of Electricity Through Gases
E&M: C - 013 Current Produced by Moving Charges
E&M: C - 014 Electric Field of a Plasma Ball

A discharge tube brought near a plasma ball will light up.

Small plasma ball, Discharge tube
E&M: C - 015 Ideal and Real Batteries

Lamps are added in parallel to current supplied by both a battery and a power supply; a noticeable difference in brightness is evident due to the internal resistance of the battery.

Power Supply, 3 bulbs in parallel, a 9V battery, a multimeter
E&M: C - 016 Photoelectric Effect

A flashlight shone onto a photoelectric tube creates an audible sound; a UV LED produces a current spike in an analog ammeter

Audio photoelectric apparatus + Flashlight
E&M: C - 017 Copper Wires of Different Cross-Sectional Areas

The voltage drop across two sections of wire having different cross-sectional areas is measured.

A red wire and a black wire in series
E&M: C - 018 Alternating Current RC Series Circuit

A frequency generator is used to produce a square wave that shows the charge and discharge curves of an RC series circuit

Oscilloscope output of a capacitor and the power source
E&M: C - 019 Direct Current RC Series Circuit

The charge and discharge curves of a DC RC Series circuit are shown in conjunction with its effect on a light bulb.

DC Voltage vs. Time curve for RC circuit
E&M: C - 020 Decrease of Resistance with Decrease in Temperature

A light bulb is turned on and its wiring is submerged in liquid nitrogen.

A dewar of liquid nitrogen rests next to the light bulb apparatus.
E&M: C - 021 Piezoelectric Crystal
E&M: C - 022 Mechanical Model of Resistance

Ping pong balls travel down a board of nails to demonstrate resistance.

A board of nails, a hose, and a box of ping pong balls
E&M: C - 023 3 Batteries and 2 Bulbs

Two 9V batteries are connected in series with 2 bulbs.  A 3rd battery is added in parallel with one of the bulbs.

2 9V Batteries are in series with 2 bulbs.  A 3rd battery is in parallel with 1 bulb
E&M: C - 024 Mixed Circuit

1 90-W bulb and 3 25-W bulbs are connected in both series and parallel

3 25-watt bulbs, 1 90-watt bulb, and an AC switch
E&M: C - 025 Identical Bulbs in Series

3 Bulbs are connected in series to a power source

3 25-W bulbs are connected in series to an AC switch
E&M: C - 026 Identical Bulbs in Parallel

3 identical bulbs are connected to a power source in parallel.

3 25W bulbs connected in parallel to an AC switch
E&M: C - 027 Wheatstone Bridge

A Wheatstone Bridge is used to demonstrate how an unknown resistance could be found.

Wheatstone Bridge Circuit