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Leyden Jar Experiment

Prep Time:

30-45 minutes

Cook Time:

  • Ensure all foil edges are smooth to avoid cuts.

  • Discharge the Leyden jar after each use to ensure it is safe to handle.

  • Never use the Leyden jar during a thunderstorm or near electrical outlets.

  • Always supervise young experimenters during the experiment.

Serves:

10+ years

Level:

Servings

About the Recipe

  • Understand the principles of electrostatics and how capacitors store and discharge electrical energy.

  • Explore the historical context and significance of the Leyden jar as an early form of a capacitor.

Ingredients

  • Plastic bottle (small size, like a soda bottle)

  • Aluminum foil

  • Wire (copper wire works well)

  • Metallic object with a rounded top (like a screw or a small metal ball)

  • Wool cloth

  • Scissors or utility knife

  • Tape

Preparation

  • Prepare the Bottle: Clean the plastic bottle and remove any labels.

  • Line with Aluminum Foil: Cut the aluminum foil to size and carefully line the inside of the bottle. Repeat the process for the outside of the bottle, making sure both layers do not touch at the top.

  • Prepare the Top: Pierce the bottle cap and insert the wire through it. Attach the metallic object to the end of the wire inside the bottle, ensuring it does not touch the sides.

  • Assemble the Jar: Place the cap back on the bottle, ensuring the wire is firmly in place and sealed around the entry point with tape to avoid loss of charge.

  • Charge the Jar: Rub the outside foil with the wool cloth vigorously to build up static electricity.

  • Discharge: Carefully touch the metal top of the wire to discharge and produce a small spark.

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