electricity 1

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electricity 1
2012-10-14 18:48:19

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  1. Electricity
    a form of energy that results from the interacton of charged particles, such as electrons or protons
  2. Electroscope
    • a device for detecting the presence of an electric charge
    • e.g. metal leaf electroscope
  3. Charging by friction
    • a process in which objects made from different materials rub against each other, producing a net static charge on each object 
    • e.g. clothes in the dryer
  4. conductor
    • a material in which electrons can move easily between atoms 
    • e.g. metal
  5. Lightning Rod
    A metal phere or point that is attached to the highest part of a building and connected to ground
  6. Radiation dosimeter
    A small device that detects and measures exposure to radiation
  7. Electrostatic precipitator
    A type of cleaner that removed unwanted particles and liquid droplets from a flow of gas
  8. Semiconductor
    • A material in which electrons can move fairly well between atmos
    • e.g. silicon
  9. Electric field
    A property of space around a charged object, where the effect of its charge can be felt by other objects 
  10. Ion
    A positively or negatively charges atom or group of atoms 
  11. Electrostatic series
    • A list of materials that have been arranged according to their ability to hold onto electrons 
    • (p.405 for table)
  12. Induced charge separation
    the movement of electrons in a asubstance caused by the electric field of a nearby charged object that is not in direct contact with the substance
  13. Charging by contact
    Generating a net charge on a neutral object by touching it with a charged object 
  14. Ground
    An object that can supply a very large number of electrons to, or can remove a very large number of electrons from, a charged object, thus neutralizing that object
  15. Static charge (static electricity)
    An electric charge that tends to stay on the surface of an object, rather than flowing away quickly 
  16. Insulator
    A material in which electrons cannto move easily from one atom to another
  17. Van de Graaff generator
    A device that accumulates very large charges

  18. Laws of electric charges
    Laws that describe how two objects interact electrically when one or both are charged

    • 1. Like charges repel
    • 2.Opposite charges attract 
    • 3.Charged and neutral objects attract each other