Question

Five identical light bulbs, each with a resistance of 10 ohms, are connected in a simple electrical circuit with a switch and a 10 volt battery as shown in the diagram below.

Which bulb (or bulbs) could burn out without causing other bulbs in the circuit to also go out?

(A) only bulb D 

(B) only bulb E 

(C) only bulbs A or E

(D) only bulbs C or D

(E) bulbs B, C, or D

Answer 1

The correct option is: (A) only bulb D 

Explanation:

A and E failing in the main branch would cause the entire circuit to fail. B and C would affect each other.