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Lens - A lens is a device for either concentrating or diverging light, usually formed from a piece of shaped glass. Analogous devices used with other types of electromagnetic radiation are also called lense. Used . s: for instance, a microwave lens can be made from paraffin wax.

The earliest records of lenses date to Ancient Greece, with Aristophanes' play The Clouds (424 BC) mentioning a b. Used . urning-glass (a convex lens used to focus the sun's rays to produce fire). The writings of Pliny the Elder (23-79) also show that burning-glasses were known to the Roman Empire, and mentions what is possibly t

Joule - A term in the international system for a unit of electrical, mechanical, and thermal energy equal to the work done when a current of one ampere is passed through a resistance of one ohm for one second. Used . . Surge protectors are often given joule ratings, but this rating refers only to the amount of energy they can absorb, not what gets through. Its value was calculated originally by James Pr. Used . escott Joule, but the term was first introduced by Dr. Mayer of Heilbronn....

Bulbs - A Bulb or light bulb is a source of artificial light. There are many different kinds of bulbs including High Intensity Discharge or HIDs, Halogen, Fluorescent and Light Emitting Diodes, but the most . Used . common is the incandescence that works by the release of electromagnetic radiation. . Used . ...

Ampere - The ampere (symbol: A) is the SI base unit of electrical current equal to one coulomb per second. It is named after André-Marie Ampère, one of the main discoverers of electromagnetism.

Th. Used . e ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 metre apart in vacuum, would . Used . produce between these conductors a force equal to 2×10–7 newton per metre of length....

Generators - Generators are used to provide power where power is otherwise not available, like in out door arenas or remote locations, or when not enough power is available at a particular location. . Used . . Used . ...