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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
• 6. Activity
• Acitivity
• Think about how you will connect the light bulb and battery to make the light bulb light up.
• 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