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Electri
 

Electri

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    Electri Electri Presentation Transcript

    •  
    • 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 .
    • Electricity that moves …
      • Current : The flow of electrons from one place to another.
      • Measured in amperes (amps)
      • Kinetic energy
    • There are 2 types of currents:
      • Direct Current (DC) – Where electrons flow in the same direction in a wire.
    • There are 2 types of currents:
      • Alternating Current (AC) – electrons flow in different directions in a wire
    • 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.
    •  
    • 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 .
    •  
    • Conductors vs. Insulators
      • Conductors – material through which electric current flows easily .
      • Insulators – materials through which electric current cannot move .
    • Examples
      • Conductors :
        • Metal
        • Water
      • Insulators :
        • Styrofoam
        • Rubber
        • Plastic
        • Paper
    • 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.
    • 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
    • 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.
    • 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.
    • Ohm’s Law
      • Resistance = Voltage / Current
      • Ohms = Volts / Amps
    • Practice with Ohm’s Law Ohms Volts Amps 4 100 25 15 150 10 2 30 15 9 45 5 6 48 8
    • What is an electromagnet?
      • Electromagnet – a magnet made from a current bearing coil of wire wrapped around an iron or steel core.
    • 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.
    • What is a motor?
      • Motor – a device that changes electrical energy to mechanical energy that can do work .