Read the following case and answer the following questions:
Riya wanted to understand how a torch works. She opened the torch and removed the two dry cells from the battery compartment. First, she placed the cells back in a different order and switched on the torch. The lamp did not glow. Next, she reversed the direction of one of the cells and again switched on the torch, but the lamp still did not glow. Finally, she arranged both cells correctly according to the polarity markings inside the torch. This time, when she slid the switch to the ON position, the lamp glowed brightly.
Riya concluded that a torch works only when the cells are placed in the correct direction and the electric circuit is complete.
Riya concluded that a torch works only when the cells are placed in the correct direction and the electric circuit is complete.
1. What happened when Riya reversed the direction of one cell?
2. What is the function of the switch in the torch?
3. Which condition is necessary for the bulb in a torch to glow?
4. Which observation helped Riya conclude that the cells must be placed correctly?