how to calculate efficiency of a machine
Efficiency Formula. Efficiency Formula. Efficiency is a measure of how much work or energy is conserved in a process. In many processes, work or energy is lost, for example as waste heat or vibration. The efficiency is the energy output, divided by the energy input, and expressed as a percentage. A perfect process would have an efficiency of 100%. Î· = efficiency (Greek letter eta) Wout = the work or energy produced by a process. Units are Joules (J). Win = the work or energy put in to a process.