How an OHP Is Used

An overhead projector (ohp) is a device that casts a transparency image on a screen. The process of on ohp includes the following steps. First, an ohp is placed on a table positioned several feet from a screen ,and it is pluged into an electical socket. Next, a transparency is placed face up on the plate glass surface of the ohp ,and the switch is turned on . Finally, the height of the ohp is adjusted so that the image is centered on the screen and,a focus knob is turned until the clear image is projected.

How a Comb into a Magnet Is Made

A magnet is no object that attracts other objects.The process of making a comb into a magnet involvese a number of steps. First, small pieces of paper are randomly arranged on a table ,and a plastic comb is briskly rubbed with a piece of wool so that it gains electrons. Next, the negativly charged comb is held over the pieces of paper and allowed to cllect them. Finally the pieces of paper are thoroughly removed from the comb and, tha steps 1 through 4 are repeat to verify results.