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Claimed lifetime can be as long as 10,000 hours which is more than ten times that of a standard incandescent light bulb. [7] Unlike fluorescent lamps, which produce light through the electrical excitation of mercury vapor, ESL lamps do not use mercury. [8] The first commercially available ESL product was a reflector bulb.
Overhead projector in operation during a classroom lesson. An overhead projector (often abbreviated to OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.
Some of the popular presentation products used across the globe are offered by Apple, Google and Microsoft. Microsoft PowerPoint and Google Slides are effective tools to develop slides, both Google Slides and Microsoft PowerPoint allows groups to work together online to update each account as it is edited. Content such as text, images, links ...
Views of a liquid crystal display, both with electroluminescent backlight switched on (top) and switched off (bottom). Electroluminescence (EL) is an optical and electrical phenomenon, in which a material emits light in response to the passage of an electric current or to a strong electric field.
Microsoft Producer for PowerPoint 2003" was a free plug-in from Microsoft, using a video camera, "that creates Web page presentations, with talking head narration, coordinated and timed to your existing PowerPoint presentation" for delivery over the web. [244]
A presentation using PowerPoint. Corporate presentations may combine all forms of media content. Multimedia finds its application in various areas, including, but not limited to, advertisements, art, education, entertainment, engineering, medicine, mathematics, business, scientific research, and spatial temporal applications. Several examples ...