Science Lessons 6-9

   Lesson 6

  • Electronics control free moving electrons; Ex: if silver had 47 protons and 45 electrons the 2 free electrons are controlled by electronics.
  • Electronics  is the science of designing or building electronic circuits to solve a particular problem.
  • Electronic circuits consist of electronic components connected together.
  • The electronic theory is:  Atoms are the basic building blocks of matter. Atoms [atomos] means indivisible.
  • Protons-positive charge
    Neutrons-neutral charge
    Electrons-negative charge
  •  Lesson 7
  • A light bulb has 2 leads an electric current goes though one then though a resistor then back though the other one
  • Ohms law described the relationship between
    Power-ability to do work (watts) ( w )
    Voltage-electric pressure (volts) ( v )
    Current- amount of electricity (amps) ( a )
    Resistance-resists current flow (ohms) ( o )
    A=V/O      O=V/A    V=A(O)    W=V(A)
  • Lesson 8
  • Resistors-resisting electrons; Conductor or insulator?
  • Copper-conductor
  • Materials resistance determined by          Thicker |
    -type                                                                                    |
    -length                                                                                |
    -diameter                                                    6 ohms       \|/
    3 ohms          6 ohms                        __________________
    Ex: ______   ____________    __________________
    2ft                    4ft                                        6ft
  • Lesson 9
  • Capacitor rapidly discharges energy; electrons move from the negative to the bottom plate, electrons move from the positive to the top plate
  • 3 types of capacitors are electrolytic, ceramic and resin
  • Flash photograph works by a photo flash capacitor supplies a quick surge of energy to the flash tube
  • When  no more electrons can be taken from the top or added to the bottom it makes the capacitor charged
  • The capacitance changes if the surface area, the conducting plates or the insulator does

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