A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.
invented by Thomas Edison
An electric light is a device that produces visible light from electric power.…
invented by William Reid Clanny
A safety lamp is any of several types of lamp that provides illumination in…
invented by Nicolas appert
Canning is a method of food preservation in which food is processed and sealed…
invented by Lester Allan
The Pelton wheel or Pelton Turbine is an impulse-type water turbine invented by…
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