Question

Assertion (A) : In our houses, the current in A.C. electricity line changes direction 60 times per second. 

Reason (R) : The frequency of alternating voltage supplied is 50 Hz. 

(a) Both A and R are individually true and R is the correct explanation of A 

(b) Both A and R are individually true but R is not the correct explanation of A 

(c) A is true but R is false (d) A is false but R is true

Answer 1

(d) An alternating current (a.c.) is one which is constantly changing direction. Alternating current have two cycles positive half cycle and negative half cycle. Mains electricity is an a.c. supply which is supplied to homes in India at 220 V AC at 50 Hz. Thus, in our houses the current in A.C. electricity line changes direction = 50 × 2 = 100 times per second.