# Science

### 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.

### 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

### Quantitative Chemistry- Sodium bicarbonate and Acetic Acid – How much carbon dioxide is produced Part1

Description: Today we will determine how much carbon dioxide is produced based on mixing 1.0 g of sodium bicarbonate and 20. mL of 5% acetic acid. This science and math word problem requires you to know chemistry and math.