(3) Electrostatic Image— Making Explanation: All Electrostatic Copiers work under the premise that a charge of electricity is placed on an Image Drum which has the ability to retain. the electric charge much like a capacitor holds its charge but with the ability to hold or release the charge depending on how much light and darkness is applied to the Image Drum. A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply.