Introduction : Introduction Enclosed materials convert chemical energy to electrical energy through redox reactions.
Fruit (enclosed material) can produce electric currents. Research : Research The energy to light a bulb comes from the reduction-oxidation reactions when metals and certain solutions meet.
Oxidation: zinc nail loses electrons.
Reduction: copper gains electrons that were lost by the zinc nail.
Overtime, zinc anode becomes positive and copper cathode becomes negative, lighting the bulb with the circuit of electrons. Problem : Problem How will different fruits’ pH affect the
amount of electrical current generated? Hypothesis : Hypothesis The lower the pH of a fruit is, the more energy it will generate, and the brighter the bulb will
light. The Experiment : The Experiment Preparation : Preparation Experimental Group Control Group Independent Variable Dependent Variable Control Group Materials : Materials Procedure : Procedure Measure pH of fruit with pH paper Cut fruit with knife in four equal pieces Slide 10: Insert zinc nail and copper penny into fruit Connect the cathodes and anodes to make a circuit with the LED Slide 11: Repeat with other fruits Use the same system with water Data: Lemon : Data: Lemon Data: Orange : Data: Orange Observation: Orange & Lemon : Observation: Orange & Lemon Data: Apples : Data: Apples Data: Pineapple : Data: Pineapple Observation: Pineapple & apple : Observation: Pineapple & apple Data: Banana : Data: Banana Data: Water (control) : Data: Water (control) Observation: Banana & Water (control) : Observation: Banana & Water (control) Sources of Error/Improvement : Sources of Error/Improvement Micro Ammeter Pennies The Real World : The Real World Conclusion : Conclusion Our hypothesis was correct!
When a fruit has a zinc anode and a copper cathode connected to a LED bulb, the higher the pH, the more electrical current will be generated.
The most acidic fruits created the strongest electric current because acids are the base for the redox reactions to take place. (ex. Lemons, oranges) Bibliography : Bibliography “Battery (electricity).” Wikipedia. Wikimedia, n.d. Web. 20 Oct. 2010. <http://en.wikipedia.org/wiki/Battery_(electricity)>.
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