Ravinder was inspired by reading the autobiography of Thomas Alva Edison and changed a portion of his room into a laboratory. In his laboratory he per-formed and activity that demonstrates both 'heating effect' and 'magnetic effect' of electric current. He connected different components with different wires and the connections are represented by the following circuit diagram.
To his disappointment, he was not successful in his effort. Observe the circuit and suggest modifications to make his effort successful.

Explanation

(1) He has to change the silk thread used to connect one of the bulbs with a battery because silk thread is not a conducting wire. (2) He has to replace .fused. bulb with a good normal bulb to make the circuit closed. (3) Switch to be made .ON..