An overhead projector (OHP) is a device that allows you to display images from either a computer/laptop or images created in real time. Overhead projectors were often used in classrooms to showcase some type of presentation on paper for a group of students to view. In more recent times, overhead projectors are being used and designed to project things on technological devices. This machine has a plastic frame that is placed on top of the projector, and a fan that cools the machine, so that it won't overheat if it is used for long periods of time. Recently, overhead projectors in classrooms and conference rooms are being replaced by things like document cameras and interactive whiteboards, since they let the presenter project video directly from a computer file. The device has sometimes been called a "Belshazzar", after Belshazzar's feast.
Overhead projector
Questions and Answers
Q: What is an overhead projector (OHP)?
A: An overhead projector (OHP) is a device that projects images from either a computer/laptop or images created in real time.
Q: Where were overhead projectors commonly used?
A: Overhead projectors were often used in classrooms to showcase presentations on paper for a group of students to view.
Q: How have overhead projectors evolved over time?
A: Overhead projectors have evolved to project things on technological devices, and now have a plastic frame and fan that keeps the machine cool when it is used for long periods of time.
Q: What are some newer technologies that have replaced overhead projectors in classrooms and conference rooms?
A: Newer technologies such as document cameras and interactive whiteboards have replaced overhead projectors in classrooms and conference rooms.
Q: Why is the device sometimes called a "Belshazzar"?
A: The device is sometimes called a "Belshazzar" after Belshazzar's feast.
Q: What is the purpose of the plastic frame on top of the projector?
A: The plastic frame on top of the projector is used to hold the materials being projected onto the screen.
Q: What is the purpose of the fan on the projector?
A: The fan on the projector keeps the machine cool so that it won't overheat when used for long periods of time.