Design Engineering Theory Topics - Home Page |

# Calculations

## 1 Calculating Area

### Area of a square and a circle

## 2 Mechanical advantage

### Mechanical advantage

- To read more about how to calculate mechanical advantage in pulleys, to this link on www.bournetoinvent.com

## 3 Pulley, belt drive and gear ratio

### Pulley ratios

- Below are videos of how to calculate gear ratios and speed calculation for a pair of gears and a compound gear set.

- The formula above applies to all drive systems. For pulleys, you would use the diameter instead of number of teeth.
- Chain and sprocket calculations will be the same as gear calculations.
- One thing to note, in gear drive systems, the gears will spin in opposite directions as they move through the gears.

## 4 Graphs

### Mean, Mode and Median

## 5 Percentages

### Percentage increase or decrease

## 6 Ohm's law

### Series resistor calculations

### Parallel resistor calculations

### Series resistor voltage calculations

### Parallel resistor voltage calculations