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Electric Charges and Currents

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Electric Charges and Currents Electric Charge 3 parts of an atom Proton ( + ) Neutron ( o ) Electron ( - ) Like charges repel Different charges attract Electric Field ... – PowerPoint PPT presentation

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Title: Electric Charges and Currents


1
Electric Charges and Currents
2
Electric Charge
  • 3 parts of an atom
  • Proton ( )
  • Neutron ( o )
  • Electron ( - )
  • Like charges repel
  • Different charges attract

3
Electric Field
  • An electric field extends outward through space
    around every charged particle
  • It is strongest near the charged particle

4
Static Electricity
  • Objects become charged when they gain or lose
    electrons
  • Friction occurs when two objects are rubbed
    against each other
  • Static electricity is the buildup of electric
    charges on an object

5
Conductors/Insulators
  • Conductors permit electric charges to flow freely
  • - examples metals, Earth
  • Insulators do not allow electric charges to flow
    freely
  • - examples rubber, glass, wood, plastic, air

6
Lightning
  • Lightning forms when there is a discharge of
    static electricity
  • Bolt travels from negative charges to positive
    charges
  • Elect. Pot. Difference is the amount of work
    required to move a charge (Volts)

7
Batteries
  • A battery is a device that produces electricity
    by converting chemical energy into electrical
    energy
  • Batteries can be either dry cell or wet cell

8
Thermocouples
  • A thermocouple is a device that produces
    electrical energy from heat energy
  • Used in car engines, ovens, and gas furnaces

9
Electric Circuits
  • A circuit provides a complete, closed pathway in
    which electricity can flow
  • Two types (series/parallel)
  • Our homes have parallel circuits - if one light
    goes out, the others stay on

10
Two Types of Circuits
11
Electrical Safety
  • Houses are protected against fires by fuses and
    circuit breakers
  • Know the 6 electric safety rules on pages 37-38
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