Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9th
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Types of current: Alternating Current (A.C.) and Direct Current (D.C.)

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  • An important advantage of AC over DC is that electric power can be transmitted over long distances without much loss of energy.
  • Most advantageous fact is that AC can be stepped up and down from one level to other easily. Transformers available for this purpose are cheap, reliable and robust in design and construction. DC can't be stepped up/down easily and economically.


  • Direct current
  • Alternating current
  • Advantages of AC over DC
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