what is the formula to calculate the efficiency of a machine
Machine Efficiency= Work done by a machine on a load divided by work done on a machine by an effort force.multiply that by 100%. Work(J)=force(N)multiplied by Distance(m). The answer above is correct but not much use for a practical situation such as a motor driving a pump or a compressor being driven by a turbine.achine Efficiency= Work done by a machine on a load divided by work done on a machine by an effort force.