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The system of three-phase alternating current electrical generation and distribution was invented by several persons in the 19th Century including Nikola Tesla, George Westinghouse and others. Thomas Edison developed direct current (DC) systems at 110 V and this was claimed to be safer. For more information about the early battles between proponents of AC and DC supply systems see War of Currents. The 110 volt level was chosen to make high-resistance carbon filament lamps practical and economically competitive with gas lighting. While higher voltages would reduce the current required for a given quantity of lamps, the filaments would become increasingly fragile and short-lived; Edison selected 100 volts as a compromise between distribution costs and lamp costs. generation was at 110 volts to allow for a voltage drop between generator and lamp.
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