Differentiate between ac and dc motor name one source of each write any two advantages of ac over dc
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What are the advantages of AC over DC and vice-versa?
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Ahmed Faizan, Electrical Engineer, Blogger, WordPress Web Developer
Answered Aug 13, 2018 · Upvoted by Yiannis Papelis, BS,MS,Ph.D., in EE (minor CS), ECE, and practicing robotici… · Author has 95answers and 224.1k answer views
Because of their inherent advantages, alternating current systems have replaced direct current systems in almost all modern utility power systems. The two major advantages of AC over DC systems are as follows:
Lower generating cost. An AC alternator is simple to construct, with no need for a complicated split ring commutator. In addition, the AC alternator permits a higher speed of rotation with lower maintenance cost and a lower cost of power generation.Easier voltage transformations. The voltage of an AC system can be changed by the use of a simple piece of electromagnetic equipment known as a transformer. The transformer permits the transmission of large amounts of electrical power at higher voltages for long distances with relatively small transmission lines and thus a lower cost of transmission.
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7 ANSWERS

Ahmed Faizan, Electrical Engineer, Blogger, WordPress Web Developer
Answered Aug 13, 2018 · Upvoted by Yiannis Papelis, BS,MS,Ph.D., in EE (minor CS), ECE, and practicing robotici… · Author has 95answers and 224.1k answer views
Because of their inherent advantages, alternating current systems have replaced direct current systems in almost all modern utility power systems. The two major advantages of AC over DC systems are as follows:
Lower generating cost. An AC alternator is simple to construct, with no need for a complicated split ring commutator. In addition, the AC alternator permits a higher speed of rotation with lower maintenance cost and a lower cost of power generation.Easier voltage transformations. The voltage of an AC system can be changed by the use of a simple piece of electromagnetic equipment known as a transformer. The transformer permits the transmission of large amounts of electrical power at higher voltages for long distances with relatively small transmission lines and thus a lower cost of transmission.
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While both A.C. and D.C. motors serve the same function of converting electrical energy into mechanical energy, they are powered, constructed and controlled differently. 1 The most basic difference is the power source. A.C. motors are powered from alternating current (A.C.) while D.C. motors are powered from direct current (D.C.), such as batteries, D.C. power supplies or an AC-to-DC power converter. D.C wound field motors are constructed with brushes and a commutator, which add to the maintenance, limit the speed and usually reduce the life expectancy of brushed D.C. motors. A.C. induction motors do not use brushes; they are very rugged and have long life expectancies. The final basic difference is speed control. The speed of a D.C. motor is controlled by varying the armature winding’s current while the speed of an A.C. motor is controlled by varying the frequency, which is commonly done with an adjustable frequency drive control.
Advantages of ac over dc:
We all know that we got ac supply in our homes and we got this supply by transmitting ac over long distances. AC can be transmitted using step up transformers but direct current or dc can not be transmitted by this method.The ac is easy to generate than dc.It is cheaper to generate ac than dc.The ac generators have higher efficiency than dc.The loss of energy during transmission is negligible for ac.The ac can be easily converted into dc.The variation of ac can easily be done using transformers either step up or step down.The value or magnitude of ac can be decreased easily without loss of excess of energy. This can be done by using choke coil.
Advantages of ac over dc:
We all know that we got ac supply in our homes and we got this supply by transmitting ac over long distances. AC can be transmitted using step up transformers but direct current or dc can not be transmitted by this method.The ac is easy to generate than dc.It is cheaper to generate ac than dc.The ac generators have higher efficiency than dc.The loss of energy during transmission is negligible for ac.The ac can be easily converted into dc.The variation of ac can easily be done using transformers either step up or step down.The value or magnitude of ac can be decreased easily without loss of excess of energy. This can be done by using choke coil.
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