# Notebooks

## The More I Know, the More I Know I Don’t Know

## Home Energy Audit Calculator

Use this calculator to easily calculate how much energy and how much money an electrical appliance in your home uses each month. Simply enter the appliance’s power usage (in watts), the number of hours the appliance is used each day on average, the approximate number of days the appliance is used each month, and the

## LED Current Limiting Resistor Calculator

Use this calculator to easily find the optimal resistance value needed to limit the current flowing through an LED. Simply enter the system voltage and the LED’s recommended forward current (in milliamps, mA) and forward voltage drop as supplied by its datasheet. Then click the “Calculate” button and voila. System Voltage (V): LED Recommended Forward

## Newton’s Third Law Explained

Consider the following scenario. Your car breaks down and a friendly truck driver offers to push your car to a mechanic. Which of the following statements is true. As the truck pushes your car down the road, the truck pushes forward on your car with more force then the car pushes backward on the truck.