Lamp holders also called lightbulb socket, lightbulb holder, light socket or lamp socket is a device which mechanically supports and provides electrical connections for a compatible light bulb. Lamp holders allow bulbs/lamps to be safely and conveniently replaced (re-lamping). There are many different standards for lampholders, including early de facto standards and later standards created by various standards bodies.
SI base Unit
Calvin2022-08-31T16:29:51+01:00The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived. The lighting related units and their physical quantities are the ampere for electric current, the kelvin for thermodynamic temperature, and the candela for luminous intensity. The SI base units are a fundamental part of modern metrology, and thus part of the foundation of modern science and technology. The names and symbols of SI base units are written in lowercase, except the symbols of those named after a person, which are written with an initial capital letter. For example, the metre has the symbol m, but the kelvin has symbol K, because it is named after Lord Kelvin and the ampere with symbol A is named after André-Marie Ampère. [Read more...]