question_answer 62)

  What is the difference between a direct current and an alternating current? How many times does AC used in India change direction in one second?

Answer:

                  The basic difference between direct current and an alternating current is as follows Alternating Current is an electric current which changes its direction (f.e., polarity after ascertain fixed interval of time. Graphically it can be represented as following Direct Current is an electric current whose magnitude is either constant or variable, but the direction of flow in a conductor remains the same. Sources of DC are voltaic cell, a dry cell , battery, DC generator etc and graphically it is shown as The frequency of AC in India is f = 50 cycle/s Time period of AC is, but AC changes its direction after every half time period Thus, in India AC change its direction after every So, in one second AC changes its direction 100 times.