• A semiconductor Peltier device generates electricity when there is a temperature difference between its two sides. The fan turns in either direction depending on which leg is hot.
  • Turn the hotplate on HI ahead of time. When the water starts boiling, turn the hotplate OFF.
  • Add ice water to one cup until it is full.
  • Fill the other cup with hot water and put the lid on to retain heat.
  • Within minutes the fan will start and continue running for ~10 minutes.

        (set out a hot pad for teakettle)