In this video, I will tell you how just one small detail can extend the life of an ordinary flashlight by 100 times or more. Now you do not need to buy new batteries every time, because they can last for a very long time. How to make an eternal flashlight in 5 minutes. Life hack - how to extend the battery life of a Chinese lantern and make it shine ten times longer than a regular one. Calculation of the resistor for the LED.
Comparison of the luminous intensity of a flashlight with different resistors.
P.s. Yes, I know, I drew the polarity of the battery the other way around, I always do this))
#eternalflashlight #ledflashlight #emergencylight