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Potato Battery Activity - PowerPoint PPT Presentation


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Potato Battery Activity. Potato Battery Activity. Part 1: Engage How does a battery power something? What is a battery made of? What happens inside the battery that allows the electricity to come out of it? Why does a battery stop working? What gets used up?

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potato battery activity1
Potato Battery Activity
  • Part 1: Engage
    • How does a battery power something?
    • What is a battery made of?
    • What happens inside the battery that allows the electricity to come out of it?
    • Why does a battery stop working? What gets used up?
    • What kind of energy does a battery contain and what kind does it create?
      • Chemical, electrical, mechanical?
potato battery activity2
Potato Battery Activity
  • Part 2: Explore
  • Supplies:
    • 2 potatoes
    • 2 pieces of copper wire
    • 2 nails
    • 3 alligator clips
    • 1 LED
potato battery activity3

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Potato Battery Activity
  • Part 2: Explore
  • Set-up:
    • Connect copper wire to + end and nail to –end of LED
    • Does the LED light up?

How can we get more voltage?

potato battery activity4
Potato Battery Activity
  • Part 2: Explore
  • Now make a series of connected batteries
    • How many potatoes do you need to power the LED?
  • What happens when you:
    • Change the direction of the LED?
    • Use only nails or only pennies?
    • Connect the potatoes in parallel?
potato battery explanation

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Potato Battery Explanation
  • Part 3: Explain
  • Does the potato actually power the clock?
  • What happens to the copper wire and zinc nail over time?
potato battery explanation1

Potatoes contain mild phosphoric acid (H3PO4)!

Potato Battery Explanation
  • Part 3: Explain
  • What is the chemistry behind the reaction?
    • Oxidation at the zinc electrode:
    • Reduction at the copper electrode:
potato battery activity5
Potato Battery Activity
  • Part 4: Evaluate
  • Could this work with other vegetables or fruits?
  • Is a potato a good alternate energy source?
potato battery activity6
Potato Battery Activity
  • Part 5: Elaborate
  • What makes a battery stop working? What gets used up?
potato battery activity7
Potato Battery Activity
  • Part 5: Elaborate
  • What else uses this type of chemical energy?
    • All batteries
    • Fuel cells

http://www2.wwnorton.com/college/chemistry/gilbert/tutorials/ch17.htm

potato battery activity8
Potato Battery Activity
  • Part 6: Summarize
    • Describe the energy transformation

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