How to Build USB-Powered Christmas Lights

If you have an unused USB port on your computer you can put it to good use and add a touch of flair to your workspace.

: Working with electricity is very dangerous. Completely disconnect your computer from electrical outlets before you begin. If you have any doubts, contact a professional.
Step 1: Strip USB cable Cut the USB cable and strip a small section of the outer sheath to expose the red and black wires inside.
TIP: Cut back and ignore the data and grounding wires -- they won't be needed.
Step 2: Prepare lights Unpack the Christmas lights and cut off the battery pack. Strip the sheathing to expose a small portion of the wires.
Step 3: Match red and black wires Locate and match up the positive-charge red wires and the negative-charge black wires on the string of lights and the USB cable.
TIP: Use a multimeter, an electronic measuring device, to make sure you are matching up the wires correctly.
Step 4: Solder Use your soldering iron to connect the two sets of wires.
TIP: If you don't have a soldering iron, you can twist the wires together and wrap them with electrical tape.
Step 5: Wrap wires Wrap a piece of electrical tape around the bundle of wires for protection.
Step 6: Plug in and turn on Plug the USB-powered lights into your computer. Now you have mood lighting for the holidays or any time of year.
FACT: In 1882, Thomas Jefferson's associate, Edward Johnson, became the first person to electrically light a Christmas tree.