Videooverhead projector

An overhead projector is a classic optical device used to project enlarged images from transparent sheets onto a screen. This lesson explores the technical components of the machine, including its lamp, cooling fan, and glass stage, while explaining its historical importance in classrooms and business meetings. You will learn about the abbreviation OHP, the specific terminology for overhead transparencies, and how this device differs from modern digital projectors. We also clarify the distinction between this equipment and the business term for operating expenses. Watch this lesson to master the usage and context of this essential compound noun.