USA: +1-585-535-1023

UK: +44-208-133-5697

AUS: +61-280-07-5697


The mechanical efficiency is the ratio of work done by the machine (Machine output) to the work done on the machine (machine input)

n m  = work output /  Work input  = power / Power input


The efficiency is always less than unity because,

Work output= Work input- Energy losses

n m = Work input- energy losses / Work input

= 1 – Energy losses / Work input

Now, Energy losses> 0

n m < 1

n e = electrical efficiency of a machine

n t  = thermal efficiency of a machine

n m = mechanical efficiency of a machine

. . The overall efficiency n0 = nm ne n t