What is the term used to describe the percentage of input work that is converted to output work?

The term that describes the percentage of input work that is converted to output work is known as efficiency. Efficiency is a key concept in physics and engineering, reflecting how effectively a system or machine utilizes energy. It is calculated by dividing the useful output work by the input work and then multiplying by 100 to get a percentage. A higher efficiency indicates that more of the input energy is being successfully transformed into useful work, while lower efficiency implies wasted energy due to factors like friction, heat loss, or other inefficiencies.

The other terms provided relate to different concepts. Power refers to the rate at which work is done or energy is transferred and is measured in watts. Conductivity pertains to a material's ability to conduct electric current or heat, while conduction specifically refers to the transfer of heat through solid materials. Each of these terms has its own significance in the study of physics, but they do not define the relationship between input and output work like efficiency does.