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Let There Be Light!
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Let There Be Light!

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Transcript

  • 1. Let There Be Light! By: Abbie Lamping
  • 2. Indicator
    • 4.2.5 describe investigations using observations and other evidence as support for explanations.
    • http://www.indianastandardsresources.org/files/sci/sci_4_2_classy.pdf
  • 3. Vocabulary
    • Circuit- Also called electric circuit. the complete path of an electric current, including the generating apparatus, intervening resistors, or capacitors.
    • Current- the speed at which such flow moves; velocity of flow.
    • Conductor- a substance, body, or device that readily conducts heat, electricity, sound, etc.
  • 4. Background Info.
    • Battery superposition: 2 batteries cause a bulb to shine twice as bright as one battery regardless of arrangement.
    • Battery as a constant current source: battery supplies same amount of current to each circuit regardless of the circuit’s arrangement
    • Complete circuit: unable to identify a complete circuit—closed loop
    • Light bulb contacts: unable to identify the two contacts on the light bulb
    • Current consumed: current value decreases as you move through circuit elements until you return to the battery where there is no more current left.
    • Direct route: battery is the only source of charge so only those elements with a direct contact to the battery will light.
    • Local: Current splits evenly at every junction regardless of the resistance of each branch.
    • Resistive superposition: 2 resistors reduce the current by 2 relative to one resistor regardless of the resistors' arrangement.
    • Rule application error: misapplied a rule governing circuits; for example, used the equation for resistors in series when the circuit showed resistors in parallel
    • Sequential: only changes before an element will affect that element
    • I/R Term confusion: resistance viewed as being caused by the current; a resistor resists the current so a current must flow for there to be any resistance.
    • I/V Term confusion: voltage viewed as a property of current; current is the cause of the voltage; voltage and current always occur together.
    • Topology: all resistors lined up geometrically in series are in series whether there is a junction or not. All resistors lined up geometrically in parallel are in parallel even if a battery is contained within a branch.within a branch.
  • 5. Activity
    • You will need:
      • Science journal, pencil
      • Clothespin
      • D-cell battery
      • Aluminum foil
      • Flashlight bulb
      • Masking tape
  • 6. Activity
    • Acitivity
    • Think about how you will connect the light bulb and battery to make the light bulb light up.
    • Experiment with your ideas.
    • Record what works and what doesn’t in your science journal.
  • 7. Activity
    • To make the bulb work:
      • Roll 2 strips of foil
      • Secure foil to either end of bulb with tape
      • Secure the other ends around the metal end of the bulb with the safety pin
      • Let there be light!
  • 8. Activity
    • Discuss what you think is causing the light bulb to light up?
      • Do you think it’s the cloths pin?
      • The foil?
      • The battery?
  • 9. Activity
    • Your Science Journal:
      • Is your place to make your recordings and observations. Feel free to add beyond the requirements.
      • If time permits you may decorate it as you wish.
  • 10. Assessment
    • Draw your circuit in your science journal.
    • Explain why the experiment worked
    • How do you think electricity flows through the battery to the light bulb