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Transcript

  • 1.  
  • 2. Static Electricity
    • The build up of an electric charge on the surface of an object.
    • The charge builds up but does not flow.
    • Static electricity is potential energy . It does not move. It is stored .
  • 3. Electricity that moves …
    • Current : The flow of electrons from one place to another.
    • Measured in amperes (amps)
    • Kinetic energy
  • 4. There are 2 types of currents:
    • Direct Current (DC) – Where electrons flow in the same direction in a wire.
  • 5. There are 2 types of currents:
    • Alternating Current (AC) – electrons flow in different directions in a wire
  • 6. There are 2 types of circuits:
    • Series Circuit : the components are lined up along one path. If the circuit is broken, all components turn off.
  • 7.  
  • 8. There are 2 types of circuits:
    • Parallel Circuit – there are several branching paths to the components. If the circuit is broken at any one branch, only the components on that branch will turn off .
  • 9.  
  • 10. Conductors vs. Insulators
    • Conductors – material through which electric current flows easily .
    • Insulators – materials through which electric current cannot move .
  • 11. Examples
    • Conductors :
      • Metal
      • Water
    • Insulators :
      • Styrofoam
      • Rubber
      • Plastic
      • Paper
  • 12. What is Resistance?
    • The opposition to the flow of an electric current, producing heat .
    • The greater the resistance, the less current gets through.
    • Good conductors have low resistance.
    • Measured in ohms.
  • 13. What Influences Resistance?
    • Material of wire – aluminum and copper have low resistance
    • Thickness – the thicker the wire the lower the resistance
    • Length – shorter wire has lower resistance
    • Temperature – lower temperature has lower resistance
  • 14. What is Voltage?
    • The measure of energy given to the charge flowing in a circuit.
    • The greater the voltage, the greater the force or “pressure” that drives the charge through the circuit.
  • 15. Difference b/t Volts and Amps
    • Example – you could say that…
      • Amps measure how much water comes out of a hose.
      • Volts measure how hard the water comes out of a hose.
  • 16. Ohm’s Law
    • Resistance = Voltage / Current
    • Ohms = Volts / Amps
  • 17. Practice with Ohm’s Law Ohms Volts Amps 4 100 25 15 150 10 2 30 15 9 45 5 6 48 8
  • 18. What is an electromagnet?
    • Electromagnet – a magnet made from a current bearing coil of wire wrapped around an iron or steel core.
  • 19. What is a generator?
    • Generator – a machine that changes mechanical energy to electrical energy
    • Usually use moving magnets to create currents in coils of wire.
  • 20. What is a motor?
    • Motor – a device that changes electrical energy to mechanical energy that can do work .