2.7

• Efficiency


  The ability to do something or produce something without wasting materials, time, or energy
• Energy that is not transferred in a system is dissipated to the surroundings
• Energy efficiency


  • The ability to do something or produce something without wasting materials, time, or energy
• Efficient washing machine


  • Uses less resources such as water, short drying time so less electricity use, and it adjusts according to the load (work done more efficiently)