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  2. History of electric power transmission - Wikipedia

    en.wikipedia.org/wiki/History_of_electric_power...

    Interconnection of local generation plants and small distribution networks was greatly spurred by the requirements of World War I, where large electrical generating plants were built by governments to provide power to munitions factories; later these plants were connected to supply civil load through long-distance transmission. [54]

  3. Spring (device) - Wikipedia

    en.wikipedia.org/wiki/Spring_(device)

    A flat spring fixed only at one end like a cantilever, while the free-hanging end takes the load. Coil spring Also known as a helical spring. A spring (made by winding a wire around a cylinder) is of two types: Tension or extension springs are designed to become longer under load. Their turns (loops) are normally touching in the unloaded ...

  4. War of the currents - Wikipedia

    en.wikipedia.org/wiki/War_of_the_currents

    The war of the currents was a series of events surrounding the introduction of competing electric power transmission systems in the late 1880s and early 1890s. It grew out of two lighting systems developed in the late 1870s and early 1880s: arc lamp street lighting running on high-voltage alternating current (AC), and large-scale low-voltage direct current (DC) indoor incandescent lighting ...

  5. Live-line working - Wikipedia

    en.wikipedia.org/wiki/Live-line_working

    Working under tension from an electrically insulating platform in a medium voltage network. In general, there are three methods of live-line working which help workers avoid the considerable hazards of live line working. [2] In various ways, they all serve to prevent current flowing from the live equipment through the worker. Hot stick or Live ...

  6. Electric power transmission - Wikipedia

    en.wikipedia.org/wiki/Electric_power_transmission

    The rate of transmission expansion needs to double to support ongoing electrification and reach emission reduction targets. As of 2022, more than 10,000 power plant and energy storage projects were awaiting permission to connect to the US grid — 95% were zero-carbon resources. New power lines can take 10 years to plan, permit, and build. [33]

  7. Balanced-arm lamp - Wikipedia

    en.wikipedia.org/wiki/Balanced-arm_lamp

    Springs can be located on the mechanical equivalent of the forearm or the upper arm, or both, as well as nearer to the base. Some lamps use tension springs, and others use compression springs. The adjacent image shows (left to right) a compression spring at rest, then under load, followed by a tension spring at rest, and then under load.

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