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5E40.24/4F30.15 Fuel Cell

 

Electricity & Magnetism Demonstrations

Demonstration Manager: Gerald Zani


Thousands of volts discharge between conducting spheres

Producing Static Charge

 

 

Charged Rods with Electroscope

To demonstrate electric charge .

5A10.10

Photo

Electrophorus

To produce small amounts of negative or positive static electric charge.

5A10.21

Conservation of Charge

To show that the total amount of charge is conserved when charges are separated by friction.

5A10.35

Coulomb's Law

 

 

Charged Rods on Rotating Stands

To demonstrate the separation of electric charge.

5A20.10

Charged Rods and Pith Balls

To show electric charge.

5A20.20

Photo

Charged Mylar Balloons

To show coulomb repulsion.

5A20.30

Electrostatic Meters

 

 

Leybold Electroscope

To measure electric charge.

5A22.10

Foil Leaf Electrometer

To show electric charge.

5A22.30

Pasco Electrometer

To measure the small voltages or small currents due to electric charges.

5A22.71

Pasco Overhead Electroscope

To show electric charge.

5A22.72

Klinger Electrometer

To show electric charge.

5A22.80

Conductors and Insulators

 

 

Copper Rod on a Pivot

To show that a neutral, uncharged conductor is attracted by both positive and negative charge.

5A30.16

Conductivity of Glass

To show that glass is an insulator when cold, but when heated the resistance changes and it becomes a conductor.

5A30.20

Induced Charge

 

 

Charge by Induction

To illustrate charging by induction.

5A40.10

Balloon on a wall

To show induced polarization of charge

5A40.22

Blow Soap Bubbles at a Van de Graaf

To show induced dipole attraction and repulsion.

5A40.24

2X4 on a Watch glass

To demonstrate polarization of water molecules.

5A40.30

Name is Different on Page

Electrostatic Machines

 

 

Wimshurst Machine

To generate high electrostatic potentials.

5A50.10

Van de Graaf Generator

To demonstrate operation of Van de Graaf and illustrate electrostatic concepts.

5A50.30

Electric Field

 

 

Hair on End

To show electric charge repulsion.

5B10.10

Foam Peanuts

To model some properties of the force and the potential on a charge placed in an electric field.

5B10.25

Electrostatic Ping Pong

A conductive pith ball bounces back and forth in the electric field between two charged plates.

5B10.30

Photo

5B10.40 Electric Field Lines

Show electric field lines for five different charge distributions.

5B10.40

Torque on a dipole

A large model for the torque induced on an electric dipole in a uniform electric field.

5B10.50

Gauss's Law

 

 

Gauss's Law

To show that the charge deposited inside a conductor resides on the outside surface, and the charge inside is zero.

5B20.15

Radio in a Cage

To show the shielding effect of a Faraday Cage.

5B20.35

Electrostatic Potential

 

 

Discharge to Various Radii

To demonstrate that for conductors at the same electric potential the rate of discharge of the electric field is HIGHER for a conductor with a SMALLER radius. 

5B30.35

Capacitors

 

 

Capacitors Sample

To compare a variety of capacitor flavors and colors.

5C10.10

Parallel Plate Capacitor

To show that if the amount of charge is constant, then changing the distance between the plates of a capacitor will also change the capacitance and the voltage, Q=CV. 

5C10.20

Dielectrics

 

 

Force on dielectric in electric field

Demonstrate the force on a dielectric in an electric field.

5C20.20

Photo

Torque on an Electric Dipole

To model the torque caused by the force of an external electric field acting on an electric dipole moment. 

5C20.33

Displacement Current

The magnetic field generated by a displacement current is measured in between two plates of a capacitor.

5C20.60

Photo

Energy Stored in a Capacitor

 

 

Discharge a Capacitor

To show the quick release of  the energy stored in a large capacitor. 

5C30.20

Mechanical Equivalent Energy in a Capacitor

To show the mechanical equivalent of the electric energy stored in a capacitor, and to show that this amount of energy is proportional to the square of the voltage. 

5C30.30

Photo

Resistivity and Temperature

 

 

Zero Resistance

To show zero resistance. 

5D20.55

Conductivity in Glass

To show that the resistance of glass is lower at higher temperature.

5D20.60

Duplicate Name

Resistivity at Low Temperature

To show that the resistance changes with the temperature.

5E20.10

Cells and Batteries

 

 

Fuel Cell

This is a demo of fuel cell technology. 

5E40.24

Lemon Battery

Creation of a primitive battery using pieces of zinc and copper embedded in a citrus fruit.5E40.25

Thermoelectric Effect

Peltier and Seebeck effect demonstrated through a single bismuth-telluride thermoelectric couple. 

5E50.60

Ohm's Law

 

 

Voltage Drop along a Wire

To show the resistance of a wire is proportional to length, and to show how the power to a lamp is decreased when the resistance of the wire is increased. 

5F10.20

Circuit Analysis

 

 

Two Bulbs

To demonstrate Kirkoff's laws with a series and a parallel connection of two identical light bulbs.

5F20.49

Series and Parallel Circuit Puzzler

A simple circuits to encourage thought about the relationships between resistance, current, voltage and power.

5F20.50

RC Circuits

 

 

RC Charge Curve

To show the voltage curve when a capacitor is charged. 

5F30.20

Neon Relaxation Oscillator

To show the RC time constant.

5F30.60

Magnets

 

 

Lodestone

To demonstrate the magnetism of a natural lodestone.

5G10.10

Magnets through Hand

To introduce the idea that the magnetic force can penetrate your hand (a non-ferrous material) without apparent obstruction. 

5G10.11

Magnet Domains

 

 

Magnet Domains

A device that uses polarized light and the Faraday Effect to view the magnetization of domains in a ferromagnetic garnet  

5G20.20

Paramagnetism and Diamagnetism

 

 

Paramagnetism and Diamagnetism

To show Paramagnetism and Diamagnetism.

5G30.10

Diamagnetic Levitation

To show diamagnetic levitation with a hover board5G30.45

Temperature and Magnetism

 

 

Curie Point

To the curie point of Nickel. 

5G50.10

Meissner Effect

To show the Meissner effect. 

5G50.50

Fields and Currents

 

 

Magnetic Field of a Bar Magnet

To visualize the magnetic field of a bar magnet. 

5H10.30

Magnetic Shielding

To demonstrate magnetic shielding. 

5H10.61

Photo

Magnetic Field around a Wire

To show that a  magnetic field is created by a current wire.

5H15.10

Solenoid and Filings

To show the magnetic field of a solenoid.

5H15.40

Field of a Long Solenoid

To show the field inside, outside, and at the ends of a long solenoid.

5H15.47

Toroid and Iron Filings

To show the field of a toroid. 

5H15.50

Forces on Magnets

 

 

Two Magnets on Pivots

To show the forces of magnets. 

5H20.10

Magnet and Electromagnet

 

 

Field of a Magnet and an Electromagnet

To show that the an electromagnet has a field that is similar to a bar magnet. 

5H25.10

Pick Up Nails

To show that the an electromagnet is similar to a bar magnet. 

5H25.11

Force on a Moving Charge

 

 

Electron Beam and Magnet

To demonstrate the force on an electron beam by a magnet field.

5H30.10

Force on a Current

 

 

Parallel Current Wires

To show that the current in a wire will create a magnetic field. 

5H40.10

Jumping Wire

To demonstrate the force on a current-carrying wire in a magnetic field. 

5H40.30

Barlow's Wheel

To demonstrate how an electric potential difference and a current can be generated when a conductor moves through a magnetic field.

5H40.60

Torque on a Current Loop

 

 

Flipping Loop

To show that the forces on a current loop inserted in a magnetic field are determined by the direction of the current and the direction of the B field. 

5H50.30

Self Inductance

 

 

Back EMF

To demonstrate the back EMF caused by interrupting the current of  a coil. 

5J10.23

LR Circuits

 

 

Coil and Lamp

To show self inductance and back EMF. 

5J20.20

RLC Circuits (DC)

 

 

RLC Ringing

To show the ringing from an RLC circuit. 

5J30.10

Induced Currents

 

 

Coil, Magnet, and Galvo

To show that a current is induced in a coil by a changing magnet field. 

5K10.20

Homopolar Generator

To demonstrate generation of DC voltage with the rotational motion of a magnet and a conductor using a method which may involve an explanation other than electromagnetic induction.  This demonstration is also known as the "Motional EMF Demonstration", the "Homopolar Generator" and the "Unipolar Motor". 

5K10.80

Can Smasher

To crush an aluminum can with a strong field strength, specifically an electromagnetic field.

5K10.90

Eddy Currents

 

 

Eddy Current Pendulum

To show the braking effects of induced eddy currents. 

5K20.10

Nib in Tube

To show Lenz's Law in a dramatic way. 

5K20.25

Jumping Ring

To show some concepts about magnetic induction.

5K20.30

Arago's Disk

To show that a magnet on a pivot held above a spinning disk will rotate. 

5K20.42

Transformers

 

 

Jacob's Ladder

To show a step up transformer.

5K30.50

Primary and Secondary Transformers

An isolation transformer has a winding ratio of 1:1.  One light bulb is in series with the primary, and a second light bulb is in series with the secondary.  

5K30.51

Motors and Generators

 

 

DC Motor

To show how a DC motor works. 

5K40.10

Bicycle Generator

To demonstrate a how a person can pedal a simple DC generator and transform mechanical energy into electrical energy capable of delivering up to a kilowatt of power directly to a resistive load.

5K40.83

Impedance

 

 

Inductive Reactance

To show the L/R time constant of an inductive circuit and that the voltage leads the current by 90 degrees. 

5L10.10

Capacative Reactance

To show the L/R time constant of an inductive circuit and that the voltage leads the current by 90 degrees. 

5L10.20

RLC Circuits (AC)

 

 

RLC Circuit

To demonstrate resonance in an RLC circuit.

5L20.10

Semiconductors

 

 

Hall Probe

To show the hall effect.

5M10.10

Photo

PN Photocell

To show a PN photocell.

5M10.60

Doped Silicon

To show a silicon semiconductor.

5M10.63

Tubes

 

 

Vacuum Tube Diode

To show a vacuum tube. 

5M20.33

Transmission Lines and Antennas

 

 

Transmission Line Sample

To show a large coaxial cable transmission line.

5N10.10

Microwaves- Standing Waves

To demonstrate microwave standing waves. 

5N10.55

Radiowaves- Energy and Dipole Pattern

To demonstrate that energy is transmitted through space in the form of electromagnetic waves, and also to show the waves are polarized. 

5N10.60

Tesla Coil

 

 

Tesla Coil

To demonstrate a Tesla coil and show how magnetic induction and resonance is used in the production of high-voltage and the wireless transmission of electricity.

5N20.40

Electromagnetic Spectrum

 

 

Projected Spectrum of White Light

To show the ROYGBIV spectrum of light.

5N30.10

 

 

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