00:00Is it possible to light an LED with a dead battery?
00:02At first, the answer seems to be no.
00:04A dead battery can't power an LED directly because its voltage is too low to forward
00:08bios it.
00:09However, the battery still contains usable energy, and a clever circuit called Joule Thief
00:12circuit, unlocks this remaining energy to power the LED.
00:15In this circuit, the transistor rapidly switches on and off while a torial coil stores and
00:19releases energy, boosting the low input voltage into high voltage pulses.
00:23Although the average voltage remains low, this rapid pulse are sufficient to overcome
00:27the LED's forward bios requirements.
00:28As a result, the LED glows even from a weak battery.
00:31This demonstrates how the Joule Thief efficiently extracts and utilizes the remaining energy
00:35from low voltage sources.
Comments