War of Currents-1880AC DC

George Westinghouse (Westinghouse) and Nikola TeslaEuropeTransformer to step-up or down voltage

Thomas Edison (Edison ElectricAmerica

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At very high voltages, (current small) losses are lower in wiresAC won the war, mainly due to advantage of using transformers with AC, in 1903.

Fun Facts about ACThe electric current from outlets in your home is AC(120V).AC has frequency associated. In the United States, the alternating current (AC) has 60 cycles each second.In Europe , the frequency of electricity is at 50Hz. If you are travelling to Europe or Asia, you will need an adapter to use the electrical appliances from US.

The prongs are different too.

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Flow of electrons and direction of current

Electrons flow from negative terminal to positive terminalCurrent flows from positive terminal to negative terminal

Current direction is opposite to the flow of electrons!!!!

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Voltage Current

Resistance

Series V1+V2+V3

Same R=R1+R2+R3

Parallel

Same I1+I2+I3

1/R=(1/R1)+(1/R2)+(1/R3)

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Ammeter always connected in seriesVoltmeter always connected in parallel

Alternating Current (AC) – current flows in both directions alternatelyDirect Current- current is flowing in only one direction

STORY of AC and DC war

Referenceshttp://amasci.com/miscon/eleca.html#light

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