Compound machines (efficiency)


A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage to multiply force. A compound machine is a machine formed from a set of simple machines connected in series with the output force of one providing the input force to the next. Mechanical efficiency measures the effectiveness of a machine in transforming the energy and power that is input to the device into an output force and movement. Efficiency is measured as a ratio of the measured performance to the performance of an ideal machine: The efficiency of a compound machine is the product of the efficiencies of the series of simple machines that form it.

Related formulas


ncompThe efficiency of the compound machine (dimensionless)
n1The efficiency of the first machine (dimensionless)
n2The efficiency of the second machine (dimensionless)