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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 ...
Harold Pitney Brown (September 16, 1857, Janesville, Wisconsin – 1944, Volusia, Florida) [dubious – discuss] was an American electrical engineer and inventor known for his activism in the late 1880s against the use of alternating current (AC) for electric lighting in New York City and around the country (during the "war of the currents").
"Dynamo Electric Machine" (end view, partly section, U.S. patent 284,110) A dynamo is an electrical generator that creates direct current using a commutator.Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current ...
Any stationary voltage or current waveform can be decomposed into a sum of a DC component and a zero-mean time-varying component; the DC component is defined to be the expected value, or the average value of the voltage or current over all time. Although DC stands for "direct current", DC often refers to "constant polarity".
The magnet was made of 18 turns of bare copper wire (insulated wire had not yet been invented). [ 1 ] William Sturgeon ( / ˈ s t ɜːr dʒ ə n / ; 22 May 1783 – 4 December 1850) was an English physicist and inventor who made the first electromagnet and the first practical electric motor .
Thomas Davenport (July 9, 1802 – July 6, 1851) was a Vermont blacksmith who, with his wife Emily, constructed the first American DC electric motor in 1834. [ 1 ] Biography
He studied the effects of electricity on animals and humans. He wrote The Effects of Electric Shock on Man, a book in which he explains the effects of different amounts of electricity on human subjects. He also invented the ground-fault circuit interrupter or GFCI in 1961. [1] The GFCI is commonly found in home bathrooms or kitchens.
DC Jim Chambers: Detective Comics #20 Wing: 1938 (October) DC Jim Chambers: Detective Comics #20 Namor the Sub-Mariner: 1939 (April) Marvel/Timely: Bill Everett: Motion Picture Funnies Weekly #1 The Guardian Angel (Hop Harrigan) 1939 (April) DC Jon Blummer All-American Comics #1 Batman (Bruce Wayne) 1939 (May) DC Bob Kane, Bill Finger ...