2. Methods

2. Research Methods

2.1 Procedures:

Preparation/Raw Skin Potato:
  1. Take a large or small potato and place firmly on a white tile.
  2. Slice potato into two halves. This will make two potato batteries of this type of potato.
  3. Place these 2 potato halves onto a clean white tile.
  4. Repeat steps 1 to 3 to create another 2 more of this potato type.

Boiled Skin Potato
  1. Fill 1000 ml beaker with 600 ml of water.
  2. Repeat steps 1 and 2 of “Preparation/Raw Skin Potato” stage.
  3. Use tongs to place the two potato halves fully submerged into water.
  4. Boil for 5 minutes.
  5. Remove potatoes using tongs.
  6. Place hot potato halves onto aluminium sheet for cooling.
  7. If possible, place the potatoes with aluminium sheet into a wet sink and spray with cool water to speed up cooling process.
  8. Once cool enough, transfer onto clean white tiles for testing.
  9. Repeat steps 1 to 8 to create another 2 potato halves.

Raw Peeled Potato
  1. Peel a large or small potato.
  2. Cut out the eyes of the potato.
  3. Repeat steps 1 and 2 of “Preparation/Raw Skin Potato” stage.
  4. Repeat steps 1 to 3 to create another 2 potato halves.

Boiled Peeled Potato
  1. Repeat steps 1 to 2 of “Raw Peeled Potato” stage.
  2. Fill 1000 ml beaker with 600 ml of water.
  3. Repeat steps 1 and 2 of “Preparation/Raw Skin Potato” stage.
  4. Use tongs to place the two potato halves fully submerged into water.
  5. Boil for 5 minutes.
  6. Remove potatoes using tongs.
  7. Place hot potato halves onto aluminium sheet for cooling.
  8. If possible, place potatoes with aluminium sheet into a wet sink and spray with cool water.
  9. Once cool enough, transfer onto clean white tiles for testing.
  10. Repeat steps 1 to 9 to create another 2 potato halves.
Testing
Screen Shot 2014-08-22 at 9.19.48 am.png
Fig. 1 - Potato Battery Cross-section.

* Refer to Fig. 1
  1. Take a nail 5 cm long and push it 3 cm deep into a prepared potato half. *
  2. Cut a copper foil piece of 2 cm by 2 cm. *
  3. Cut a slit 1.5 cm deep and 2 cm wide with a knife into a prepared potato half. *
  4. Insert the copper foil into the slit. *
  5. Test the potato for electricity using the multimeter.
    1. Attach one end of a red alligator clip wire to the copper foil and one end of a black alligator clip wire to the nail.
    2. Attach the other end to the multimeter. Match the colours of the wires with the colours of the multimeter probes. (E.g. Black to Black, Red to Red.)
  6. Record down the results onto a table.
  7. Repeats steps 1 to 6 to test the other 3 prepared potato halves of this type.
ISS Potato Battery Series Circuit Set-Up.jpg
Fig. 2 - Potato Batteries Arranged in Circuit
* Refer to Fig. 2
  1. After recording the results for all 4 potato halves of one type separately, wire them together in a series circuit. *
  2. Test and record down the amount of voltage generated by all 4 potato halves.
  3. Disconnect the multimeter and wire the potato halves up to a LED bulb to see if it will light up. **
**Do not do so if the amount of voltage exceeds the voltage the LED bulb can handle.
  1. Record the results down onto a table.
  2. Repeat steps 8 to 11 for each batch of 4 prepared potato halves type.

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