Forward and reverse heat engines are discussed and explained at this site from Applied Thermodynamics. Diagrams are provided. Efficiency equations are given and discussed.

Explains what a lever is, its history, how it works, the formula for calculating its mechanical advantage, classes of levers, and uses of levers.

The P-V diagram for a diesel cycle is provided and discussed at this site from Applied Thermodynamics. The steps of the thermodynamic cycle are labeled (and defined elsewhere). An equation for thermal efficiency is given.

An interactive "machine" allows you to see first hand how a function works. Enter several input values, receive the output values, and determine the algebraic function.

How does a computer work? The critical components of a computer are the peripherals (including the mouse), the input/output subsystem (which controls what and how much information comes in and out), and the central processing unit (the...