15-year-old girl invents
flashlight powered only by body heat
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By Ashley Collman:
A 15-year-old girl in Canada has
invented a flashlight that only needs the warmth of the hand to turn on.
Ann Makosinski, a high school junior in Victoria, British Columbia, was
trying to think of a way of harvesting untapped energy when she was inspired
to make the flashlight.
She realized that the warmth generated by the human body was an overlooked
Her project objective was to create a flashlight that ran solely off the
heat of the hand.
That objective was accomplished when she discovered Peltier tiles, which
produce electricity when one side of the tile is heated and the other is
Makosinski realized she could use these tiles to create energy for her
flashlight if she left the device hollow.
Holding the flashlight on the outside would cause the tiles to heat up on
one side while the ambient air would cool down the tile on the inside of the
The power created by the tiles was enough to power an LED light, but it did
not create enough voltage.
To troubleshoot that issue she created a circuit that would allow for
transformers, upping the voltage.
It worked! The flashlight does have one issue: it works better in colder
temperatures since the inside is better able to cool down comparative to the
person's body heat.
Read more and see video:
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