Electric light energy and power

Fuses

Fuses The Electricity Board’s fuse is usually of the cartridge type, in which the fuse element is enclosed in a tubular container filled with quartz sand. The ordinary house fuses generally consist of short lengths of tinned copper wire or cartridge. fuses fitted into carriers made of porcelain or other insulating material. The special fused plug used in ring …

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Board of Trade unit of electric energy. The kilowatt hour

Board of Trade unit of electric energy. The kilowatt hour If an electricity meter is inspected it will be found to have the abbreviation kWh inscribed on it. This stands for kilowatt hour, which is the commercial unit of electric energy. As its name implies, the kilowatt hour is the energy supplied by a rate of working of 1000 …

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Fluorescent lighting

Fluorescent lighting Besides giving out coloured light, a mercury vapour discharge tube also emits ultraviolet light. When ultraviolet light, which is itself invisible, falls on certain minerals they glow brilliantly with various colours. This phenomenon is called fluorescence. Accordingly, the inside of a mercury discharge tube may be coated with a mixture of various powders which give out either …

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