Q:
A: I'm not sure what you are asking, but am assuming that you want to know how laser printers work. The printer's drum is first charged with static electricity. Like with socks from the dryer, static electricity can make objects stick to each other. The charge isn't very strong, but is fine for the short time it is needed. A laser is used to draw the image being printed. The laser beam discharges the metal drum where it is drawing, so it is in effect painting the image on the drum temporarily. Next, the drum is covered with an electrically charged powdered plastic toner. The toner sticks to the discharged areas -- it is repelled by the charged area on the drum. Again, this is a temporary image since the static charge is weak. The paper is rolled over the drum, and a stronger charge is applied to the paper at the same time the drum is discharged. This transfers the toner to the paper. The toner covered paper is ran through a pair of heated rollers, and the heat and pressure melt the toner and fuse it to the paper.