How can we increase the efficiency of a machine ​

Preventive maintenance is where measure are taken beforehand so that the chances of breakdown are minimised resulting in increased efficiency of machines. It is the maintenance that is regularly performed on any equipment to lessen the likelihood of it failing.

Explanation:

Answer from Gauth math

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

explanation:

the wires in the toaster turning red and the toast crisping and turning brown