Read the case to answer the questions given below:
A science teacher prepared a simple voltaic cell using two different metal plates dipped in a salt solution inside a container. When wires were connected to a bulb, the bulb glowed dimly. After several days, the cell stopped working because the chemicals inside were used up.
1. What caused the bulb to glow?
2. The salt solution in the cell is called
3. Why did the cell stop working after some days?