When a machine is said to be 100% efficient, it means that all of the energy put into the machine is converted into useful work without any energy being lost as waste.
In theory, it is possible for a machine to be 100% efficient. However, in reality, no machine can achieve 100% efficiency due to factors such as friction and heat loss.
Some examples of machines that are close to 100% efficient include solar panels, which convert sunlight into electricity with very little energy loss, and LED light bulbs, which have a much higher efficiency compared to traditional incandescent bulbs.
The efficiency of a machine can be calculated by dividing the useful output of work by the total energy input. This is expressed as a percentage, with a higher percentage indicating a more efficient machine.
Higher efficiency in machines leads to less energy waste, which can ultimately save money and resources. It also helps to reduce the negative impact on the environment, as less energy consumption means less pollution and greenhouse gas emissions.