Question

The charge associated with a bulb rated as 20 W, 200 V and used for 10 minutes is ____________

(a) 36 C

(b) 60 C

(c) 72 C

(d) 50 C

The question was posed to me in my homework.

The origin of the question is Advanced Problems on Network Theorems topic in section Useful Theorems in Circuit Analysis of Network Theory

Answer 1

Correct choice is (b) 60 C

To explain I would say: Charge Q= It

Given I = \(\frac{20}{200}\) = 0.1 A, t = 10 X 60 sec = 600 sec

So, Q = 0.1 X 600 = 60 C.