How to Make a Capacitor

••• milan2099/iStock/GettyImages

A capacitor is a device for storing a small electric charge. When two conductive plates are separated by a small insulator called a dielectric, they produce an electric field. The strength of this field is called the capacitance of the capacitor. The thinner the insulator and the wider and flatter the conductors, the higher the capacitance. Aluminum foil is conductive while cling wrap is insulating. Both are flat and thin, making them ideal materials for building a do-it-yourself capacitor.

    Strip the insulation off the ends of two pieces of copper wire. About an inch or two should be enough.

    Lay a sheet of cling wrap down on a table. Try to spread it out completely flat with no wrinkles in it.

    Lay a sheet of aluminum foil in the middle of the cling wrap. The aluminum foil should be at least a centimeter or so shorter and narrower than the cling wrap. The longer and wider the aluminum strip, the more electricity the capacitor can store.

    Attach one wire to the edge of the aluminum foil sheet by taping it down with some cellophane tape. Make sure the wire is actually in contact with the foil.

    Lay another sheet of cling wrap exactly on top of the first sheet. Then, lay a second sheet of aluminum foil on top and attach a second wire directly above the first.

    Carefully roll the whole pile into a cylinder with the cling wrap on the outside. Then, cover the whole thing in cellophane tape to hold it together.

    Things You'll Need

    • Wire
    • Wire strippers
    • Cling wrap
    • Scissors
    • Aluminum foil
    • Cellophane tape

Related Articles

How to Make a Powerful DC Electromagnet
Capacitors in Series & Parallel: What Is It, Formula,...
How to Make an Electroscope for a Science Project
How to Get From 120 Volt to 240 Volt
How to Make an Electric Motor Using a 9V Battery
How to Make a Light Bulb Work With a Battery
How to Make a Simple Circuit for Kids Using a Battery...
How to Make a Powerful DC Electromagnet
Quick & Easy Experiments With Magnets
How to Create an Electric Field Without Magnets
How to Make a Simple Robot At Home
How to Build a Magnetic Coil
How to Make a Super Power Electromagnet
How to Charge a 12V Battery With a DC Motor
How to Make a Negative Charge Magnet
How to Make a Buzz Wire Game
What Is a Ferrite Clamp?
Capacitors in Series & Parallel: What Is It, Formula,...
How to Make a Windmill for a School Project
How to Make a Simple Circuit

Dont Go!

We Have More Great Sciencing Articles!