Make: Online : Powering LEDs costs mere pennies

Powering LEDs costs mere pennies

Matthew writes - "Lately the hoopla concerning LED lighting has been overwhelming. Everyone claims this costs mere pennies to power. I decided to put a new twist on a classic science experiment to prove that LEDs do cost pennies to power. Literally." This is a great how to on making a battery to power a LED from pennies, an ice cube tray and salt water - Link.

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