Question

if bulb 1 burns out, what will occur?

Answer 1

The same current flows through each part of a series circuit. ... In the same way, if one of the bulb was unscrewed, the current flow to both the bulbs would be interrupted. If the circuit were a string of light bulbs, and one burned out, the remaining bulbs would also turn off.

Answer 2

Answer:

All the bulbs will also stop working in the case of series, whereas no effect will appear in the case of parallel arrangement.

Hope this helps.....