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Current Electricity
The program examines how a flow of electric charge is harnessed when an electrostatically charged object is grounded. A dry cell, or "battery," is introduced as a source of current electricity. The concepts of complete circuits, their energy conversi...(more details) |
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Potential Difference
Additional concepts needed for the complete description of an electrical circuit-such as potential difference-are introduced in this program. The analogy of a ski lift and skiers is used to demonstrate changes in electrical potential energy. Finally,...(more details) |
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Resistance
Focusing on a simple circuit, the last program introduces the concept of resistance, or relative differences in conductivity, which is explained in terms of varying numbers of free electrons and pathways for electron flow. The program concludes with ...(more details) |
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Charging and Discharging
This program examines the following electrostatic laws: like charges repel, unlike charges attract, and a charged object attracts a neutral object. Animation shows what happens when an electrically charged object is grounded, and how a metal-leaf ele...(more details) |
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Charging by Induction
A review of the concepts of charging by contact and discharging by grounding illustrates how a charged rod affects an electroscope. One application of charging by induction is demonstrated with a simulation of the action of lightning during a thunder...(more details) |
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