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26 Cards in this Set
- Front
- Back
Law of electric charges
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like charges repel and opposite charges attract
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electric force
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force between charged objects depends on size of charge and distance between charges
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electric field
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a region around a charged particle that can exert a force on another charged particle
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friction
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rubbing two objects together can cause electrons to be wiped from one object and transferred to another
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conduction
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electrons are transferred from one object to another by direct contact
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Induction
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charges in an uncharged object are rearranged without direct contact with a charged object
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conservation of charge
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no charges can be created or destroyed
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detecting charge
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use an electroscope
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electroscope
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a metal ball attached to a metal rod with two metal leaves hanging.
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conductors
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a material in which charges can move easily
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insulators
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a material in which charges can not move easily
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Examples of conductors
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copper, silver, aluminum, mercury
(metals) |
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examples of insulators
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plastic, rubber, wood, glass
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static electricity
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the buildup of charges on an object
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electric discharge
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loss of static electricity as charges move off an object
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lightning rods
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pointed rod attached to ground by wire, placed at tallest point on a building
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grounded
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in contact with the earth
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electric current
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a flow of charges
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cell
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a devise that produces an electric current by converting chemical energy into electrical energy
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battery
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device composed of several cells
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electrolyte
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part of a cell, mixture of chemicals that converts chemical energy into electrical energy
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electrodes
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part of a cell, two different conducting materials in contact with the electrolyte
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wet cell
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liquid electrolyte
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dry cell
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solid or pastelike electrolyte
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photocell
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part of a solar panel that converts light into electrical energy
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thermocouples
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device that converts thermal energy into electrical energy
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