What is Direct Current ?

Thomas Edison, on the other hand, had constructed 121 DC power stations in the United States by 1887.

A turning point in the battle came when George Westinghouse, a famous industrialist from Pittsburgh, purchased Nikola Tesla’s patents for AC motors and transmission the next year.

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The other option is to power the circuit directly from the rectified DC and have the battery work as a backup power when the AC mains supply is unavailable (i.e. in a laptop).

In the late 1800s, DC could not be easily converted to high voltages.

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As a result, Edison proposed a system of small, local power plants that would power individual neighborhoods or city sections

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Power was distributed using three wires from the power plant: +110 volts, 0 volts, and -110 volts. Lights and motors could be connected between either the +110V or 110V socket and 0V (neutral). 110V allowed for some voltage drop between the plant and the load (home, office, etc.).

Power supplies range from simple regulators with one output

Even though the voltage drop across the power lines was accounted for, power plants needed to be located within 1 mile of the end user. This limitation made power distribution in rural areas extremely difficult, if not impossible.

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smps power supplies that are more regulated and capable of supplying multiple outputs such as those required to power a computer.

With Tesla’s patents, Westinghouse worked to perfect the AC distribution system. Transformers provided an inexpensive method to step up the voltage of AC to several thousand volts and back down to usable levels

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. At higher voltages, the same power could be transmitted at much lower current, which meant less power lost due to resistance in the wires.

The voltages and current’s capacity of a power supply depend on the design

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As a result, large power plants could be located many miles away and service a greater number of people and buildings.

Current capacity

An ideal DC supply should provide a constant voltage and adequate current throughout the operation of the equipment.

Over the next few years, Edison ran a campaign to highly discourage the use of AC in the United States, which included lobbying state legislatures

s and spreading disinformation about AC. Edison also directed several technicians to publicly electrocute animals with AC i

given period determined by the rating of the battery and the load.

because it presented fewer risks and promised higher reliability than competing