Question

Efficiency of machine is 80% what does it mean?

Answer 1

PEEFECT ANSWER FOR YOU BUDDY✅
It means that the machineconverts 80% of the power of its input fuel source to actual work. There is 20% waste likely as heat, noise or wear. Note that amachine powered by solar power is considered part of a 100%efficient system because rejected energy dissipated into the environment would have dissipated anyway