Discover the power of Halloween Pumpkins


We have said goodbye to Halloween, but what about the jack-o-lanterns left over? Don’t just trash them into the bin, try this cool science project by Instructables user Will_W_76 and turn those old pumpkins into a battery.

Materials required

Note: One pumpkin is enough to try the project. But if you want more voltage then you can use more pumpkins. Will has used two pumpkins connected in series to get more power.

Following are the materials required to make this battery.

Pumpkins, Galvanized screws or nails

Galvanized just means it has been coated with zinc, any thing zinc-coated should work.
Something copper, like nails or segments of  wires

All these materials can be bought from any hardware store for less than a dollar. Using alligator clips will connect everything easier. These clips come in packages of 4-6 and would cost you only a few dollars.


1. Insert the Galvanized Material

Insert one galvanized screw into each of the pumpkins. Allow the screw ends to expose a bit so that it can connect to the wires later on.

2. Insert a strip of copper 

In the same way, insert a piece of copper in both the pumpkins. The copper should be placed closer to the galvanized screws but be careful that they do not meet inside or outside of the pumpkin.

3. Connect the Pumpkins

Connect the galvanized screws in one of the pumpkins with the copper piece of the other pumpkin using one of your wires. This will connect the pumpkins in series resulting in high voltage.

4. Connect Power wires to the Pumpkins

Use a different wire to connect the unconnected strip of copper on one of the pumpkins. Will used a red wire because a positive voltage is produced at this end of the battery. Connect the other end of this wire to the unconnected galvanized screw of the other pumpkin.

5. Pumpkin power

Now voltage is produced at the other ends of the wires you just connected. The resulting voltage measured 1.613V on a digital multimeter. The voltage may differ depending on the type of the Zinc/copper items you use and also the pumpkins.

Via: Treehugger