This one is for xerox copying.
A photocopier uses electrostatic charge to produce a copy.
The original pageis placed onto a sheet of glass.
An image of this page is projected onto a positively charged drum.
The drum has a coating that conducts electricity when light falls
on it. The parts of the drum which are lit by the projected image
lose their electrostatic charge when they start to conduct.
A black powder is negatively charged.
The toner is attracted to the positively charged parts of the drum.
The drum rotates and rolls against a piece of copier paper.
The toner is transferred from the drum to
the paper making a black and white image of the original.
Finally, the paper is heated which makes the toner stick to it.
This is called "fixing" the image.
