How to determine the resistor for LED light with Rechargeable Lithium Battery
Description:
Today we are going to use math and science to build a rechargeable LED light. For the science part, you will need: Rechargeable Lithium Battery, 150 ohm resistor, and white LED light (from Christmas LED lightbulb). For the math part, you...
How to remove micro resistors and capacitors from motherboard or circuit board
Description:
How to remove micro resistors and capacitors from motherboard or circuit board
Electronic Salvage SMD resistor from CFL to LED Flashlight powered by rechargeable lithium battery
Description:
I salvaged SMD resistors from broken CFL nightlight to make LED flashlight. Since it has 150 ohm SMD resistor, I can solder together a small portable flashlight powered by rechargeable 250 mAh lithium battery.
How long does light take to travel around the earth- Math and Science Word Problem Episode 1
Description:
Today's practical Math question: How long does light take to travel around the earth? You will need to know the circumference of the earth and the speed of light to solve this question.