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17 Cards in this Set
- Front
- Back
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Electricity |
A form of energy that results from the interaction of charged particles. |
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Static electricity |
-Electricity that is formed by the build up of charges on the surface of an object. -Results from rubbing two objects of different materials together (charging by friction). Ex: clothes in dryer, combing your hair, socks on carpet... More common in the winter when it is dry because water absorbs charges. |
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What happens when you charge by friction? |
One object loses electrons and becomes positive and the other gains electrons and becomes negative. The object that gained electrons pulled the object that has a weaker hold to them. |
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State the Law of Electric Charges. |
1. like charges repel 2. opposites attract 3. Neutral objects are attracted to charged objects |
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What is the Electrostatic series? Explain what it is? |
A list of materials that are arranged according to their ability to hold electrons. The materials at the top of the list have a weaker hold on electrons (become +) and the materials at the bottom of the list have a stronger hold on electrons (becoming -). |
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Define insulator, conductor and semiconductor. |
Insulator: a material that does nit let electrons move through it. (plastic) Conductor: a material that allows electrons to move from atom to atom. (metals; cooper) Semiconductor: non-metals that allow electrons to move fairly well. (silicon) |
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What is a ground object? |
An object that has a very large number of charges. Allows + charges to take electrons and - object to take electrons. The Earth is the biggest ground. |
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What is grounding? |
When static charges are removed from one object and it becomes neutral. |
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Why is a stream of water more conductive then mist? |
Because their is more contact with a heavy stream of water than mist therefore giving more chances to firemen to get electrocuted. |
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Charging by contact |
Generating a charge on a neutral object by touching it with a charged object. |
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Charging by induction |
NO CONTACT, when a charged object is brought near a neutral object which causes charge separation. This is temporary. |
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How is lightning formed? |
Storm clouds can form in humid air. When warm air rises to meet a colder air mass they church together, lightning is formed. Lightning is produced when negative charges at the bottom of the cloud are attracted to positive charges on the ground. |
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What is a lightning rod? How does it work? |
Metal sphere attached to the highest building and connected to the ground. A thick insulated wire connects the the lightning rod to a metal plate in the ground allowing the charge to go into the ground instead of through a building (prevents lightning strikes). |
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Precipitator |
A type of cleaner that moves unwanted particles and liquid droplets from a flow of gas. It reduces air pollution. |
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Photocopiers, Laser Printers and Scanners |
Selenium is a good conductor in the light. It is used in photocopiers, scanners and laser printers because electrostatic image is made on an aluminum drum coated with selenium. |
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Van de Graaff generator |
A device that accumulates and can transfer very large charges. A sphere rests on an insulated column, inside the column, a rubber belts rolls over a motor which cause charging by friction. The positive charges accumulate on the metal sphere. Van de Graaff generators have been used in atom smashers and in space technology. |
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Radiation dosimeter |
A small devise used to detect and measure exposures to radiation. |
