Connecting electric bulbs in series:
1. Connect three torch bulbs in series as shown in figure.
2. Connect this to a dry cell. Observe the brightness of each of the three bulbs.
3. Now connect one more dry cell in series with the first cell.
4. Observe the brightness of each of the bulb.
5. Then connect one more dry cell in series with the first two cells. Again observe the bulbs. The brightness of the bulbs increases with the addition of cells.
6. In series connection of bulbs, if one bulb gets fused, all the other bulbs in the series will stop glowing.
7. It means that if one bulb is disconnected the other bulbs do not glow. This is the disadvantage.
8. This can be observed in serial bulbs used in decorative items at the time of marriages and other festivals.
