Question

An ac voltage source of E = 150 sin 100 t is used to run a device which offers a resistance of 20Ω and restricts the flow of current in one direction only. The r.m.s. value of current in the circuit will be 

(a) 1.58 A 

(b) 0.98 A 

(c) 3.75 A 

(d) 2.38 A

Answer 1

The correct option is (c) 3.75 A.

Explanation:

As current flows in a single direction, the device allows current only during positive half cycle only