Advantages and Disadvantages of Ad and Dc

May 14th, 2015
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 The slip rings of an AC generator have a continuous surface that allows the brushes to remain in contact with the ring’s surface. Thus the brushes in an AC generator do not wear out as fast as in a DC generator as they do not create an electric short circuit every half-turn. 

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Advantages and Disadvantages of Ad and Dc1HSC PHYSICS > MOTORS AND GENERATORS| AC & DCGather secondary information to discuss the advantages and disadvantages of AC and DC generators and relate these to their use.AC generatorsAdvantages The slip rings of an AC generator have a continuous surface that allows the brushes to remain in contact with the rings surface. Thus the brushes in an AC generator do not wear out as fast as in a DC generator as they do not create an electric short circuit every half-turn. Therefore they required less maintenance and is more reliable that DC generators. ACs voltage can be changed by transformers. It is more readily transformed to different voltages than DC. Because of this property, AC can travel longer distances on high voltage (low current) with minimal power loss. Transformers can step-down the voltage to the adequate amount to be used in homes and buildings.Disadvantages Power is lost through heat on transmission lines due to inductance and resistance which causes voltage drops. To minimise power loss, long distance transmission is run on high voltage (low current).Applications of ACa a a a Most commercial motors are AC motors. In the 1960s, solid state diodes enabled AC to be converted to DC. AC generators (aka alternators) have replaced DC in in cars. Automotive alternators have advantages over DC generators as they use slip ring which provides an extended brush life over

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