Let There Be Light!


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Let There Be Light!

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