In physics class, the teacher said that the string of colored lights used at home in 2008 were all series circuits. I have a question. Electrical appliances in series circuits interact with each other

In physics class, the teacher said that the string of colored lights used at home in 2008 were all series circuits. I have a question. Electrical appliances in series circuits interact with each other. (Festival lights) The light source industry is called string lights. For example, 40 lamps are connected in series, and the voltage is 220V, and each lamp is 5.5V V. Because they are connected in series, if one filament is broken, a string of lamps will not light up. In order to overcome this problem, a "fuse" is wound on the filament lead of each lamp. It is an aluminum wire (connected in parallel with the filament), with a thin layer of alumina on its surface, which can withstand tens of volts, and it is an insulator at 5.5V In case the filament breaks, the lamp will withstand 220V, so the "fuse" will instantly break down and become a conductor. At this time, the remaining 39 lamps will continue to light up, and each lamp will bear a voltage of 5.6V.

If you look at a light bulb carefully, you can see that there are several thin wires wrapped around the guide wire under the filament in the light bulb. This is the so-called fuse.