Question

In a circuit an alternating current and a direct current are supplied together. The expression of the instantaneous current is given as i = 3 + 6 sinωt . Then the r.m.s. value of the current is 

(a) 3 A 

(b) 6 A 

(c) 3√2 A 

(d) 3√3 A

Answer 1

The correct option is (d) 3√3 A.

Explanation:

The given current is a mixture of a dc component of 3 A and an alternating current of maximum value 6 A

Hence r.m.s. value