Electrostatic Devices

Construct one or more electrostatic devices and explain how they work according to the particle model of electricity. 

Include: pieplate electrophorus

Demonstrate and explain the like nature of electrostatics and current electricity

Include: discharge an electrophorus through a neon bulb

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Make an electroscope and test a variety of objects for charge (here are more examples)

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The animation below shows an electroscope being charged by a balloon. (click on the picture to play the animation)

Read about how this works
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Electricity & Magnestism deo

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Go to the "interactive electrophorus" and find out how it works

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Another interactive demonstration

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Make an electrophorus and test a variety of objects for charge

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Read through "Tips & Tricks for Electrostatic Experimenters"

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Construct a film canister Leyden Jar (notes & facts)

Complete the following for extra credit:

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Research some of the early electrostatic devices built by scientists:
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Von Guericke's sulfur globe

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Volta's electrophorus

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Kelvin's water drop static generator

 

Other Interesting Links

Electrostatics Energy Quest The Electricity Map
Electrostatic Experiments Electrostatic Activities Van de Graff Generator
Lemon Battery Static Experiments Super Sparker

How did the convention that electric current flows from positive to negative get established?

In the 18th century a number of people made investigations of static electricity. Charles Dufay distinguished between vitreous electricity (the sort created when glass or rock crystal was rubbed) and resinous electricity (the sort created when resin or a wax rod was rubbed). Dufay proposed a two-fluid theory of electricity, the two fluids corresponding to the two types of electricity. Benjamin Franklin proposed a one-fluid theory, hypothesizing that that the two apparent types of electricity were, in fact, occurrences of excesses and deficiencies of a single electrical fluid. Franklin introduced the terminology 'positive' and 'negative' to denote, respectively, an excess of electrical fluid and a deficiency of electrical fluid. It was on the basis of certain charging and discharging phenomena that Franklin assigned the designations 'positive' and 'negative', and in the 19th century the terminals of electric batteries were labeled 'plus' and 'minus'. Early in the 20th century it became clear that in most instances of the transfer of electric charge, it is electrons (negative charge carriers) that move, but by then the labeling conventions were firmly established.