Question 32 of 91

An alternating current is given by the equation i=i1cosωt+i2sinωt. The r.m.s. current is given by

(1) 12(i1+i2)

(2) 12(ii+i2)2

(3) 12(i12+i22)1/2

(4) 12(i12+i22)1/2