That's a fun question! Here's a good answer I
found by pasting your question into a google
Light an LED with five cents. Use 5
pennies newer than 1982 [the metals in pennies
changed in 1982]. You need to sand the copper off
1 side of 4 pennies so there is zinc on 1 side.
LED light bulbs don't need much energy to light.
The directions are at the website. I chose the
Exploratorium website, because I know they do good
science for kids.
Here are some other links:
1 - this is a fun YouTube video that uses 10
copper coins and 10 little circles of aluminum
2 - this YouTube video shows how hard it is
to sand the copper off the pennies and says you
can use silver-colored zinc washers from the
hardware store so you don't have to sand the
copper off the pennies.
link 3 - this site uses 4 pennies and 4
nickels, so you don't have to sand the copper off
1 side of the pennies. But you use a volt meter
to measure the voltage from the coin-battery.
link 4 - this site uses pennies and nickels,
Thank you for your question, Lily - maybe I'll
try this with my granddaughters!
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