Question

A bulb rated 100 W, 220 V connected to an ac supply of 220 V. Find peak current in the bulb. 

(1) 8 A 

(2) 0.64 A 

(3) 3.2 A 

(4) 2 A

Answer 1

Correct option is: (2) 0.64 A 

\(P = V_{rms} I_{rms}\)

\(100 = 220 \ I_{rms}\)

\(I_{rms} = \frac{10}{22}\)

\(I = \frac{10}{22} \sqrt{2}\)

\(I= 0.64\ A\)