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How many times AC supply in India reversed its direction in one second.
Frequency of an AC current implies number of complete waves present in a second. In India, the Ac current has a frequency of 50 Hertz. 50 Hertz frequency means that there are 50 waves present in a interval of one second. And we know from the previous question that in one wave current changes its direction twice, so in 50 waves it will change its direction 100 times.
Mr. Sharma used to park his car in the basement of his house. One day in the morning he noticed that his basement is full of knee-deep water and its walls were wet because of the hours-long rain at night. When he entered the basement, he experienced a major shock. His father seeing him from outside, rushed to the main switch and switched it off and thus saved his life.
(a) Why Mr. Sharma experienced the shock?
(b) What precautions should Mr. Sharma take to avoid such incidences in future?
(c) Which qualities were shown by Mr. Sharma’s father?