Pinching Your Pennies? Make a Battery Out of Them!

So this type of project might not give you free energy, power up your TV or light up your house, it may give some extra juice to a calculator or LED.  Plus, its a fun way to teach your children about energy.

Supplies:

• 10 Pennies (1983 or older)
• Paper towels, cardboard or other absorbent material
• Lemon juice (salt or vinegar works too)
• Sand paper
• Aluminum foil
• LED

How To:

1. Sand down one side the pennies to remove the copper outer core and reveal the inner zinc.
2. Cut the paper towels to be the same size and shape of the pennies.
3. Soak the paper towel in the lemon juice and blot dry so liquid is not dripping. 
4. On top of the aluminum foil layer the pennies and pieces of paper towels like a sandwich.  It should be in this order: Copper side down, paper towel, copper side down, paper towel... The cooper side will be the positive and the zinc or sanded side will be the negative. 
5. Wrap your new battery cell in electrical tape. Make sure it is air tight to prevent the paper towels from drying to quickly. 
6. Connect an LED light bulb (around 6 volts) to the pennies. 
7. Light it up! It should stay lite for about 2 weeks. Add more pennies and it should stay lite longer.

Want some history on batteries to go along with? Check this out!