Sometimes, by carefully turning the burned out lamp, it is possible to reconnect the ends of its broken thread. In this case, the thread is slightly shortened, and such a lamp can burn for some time, and much brighter than before. Why?
The lamp will glow brighter than before because with a decrease in the length of the filament, the resistance of the lamp decreases, and according to the Joule-Lenz law, the released amount of heat is inversely proportional to the resistance at an equal voltage, and more heat will be released on the lamp.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.