That is called the efficiency, and it is a number between 0 and 1 (or 0% and 100%). It is obtained by dividing output power / input power.
The measure of how much useful work a machine puts out compared to the work put into it is called its efficiency. It is expressed as a ratio of output work to input work, typically represented as a percentage. Higher efficiency signifies that the machine is making better use of the energy it receives.
mechanical efficiency
Efficiency
To calculate the efficiency of a machine, you need to know the amount of useful work output produced by the machine and the amount of total energy input supplied to the machine. Efficiency is calculated by dividing the useful work output by the total energy input and multiplying by 100 to express it as a percentage.
Efficiency is indeed a measure of how well a machine converts input energy into useful output. It is calculated by dividing the useful output by the total input. Higher efficiency indicates better performance and less wasted energy.
The efficiency of a compound machine is calculated by dividing the output work of the machine by the input work. Mathematically, it can be expressed as Efficiency = (Output work / Input work) * 100%. It gives a measure of how well the machine converts input work into useful output work.
It's efficiency would be 100%, but it's basically a theoretical ideal, because no matter how much it is minimized, "machine" automatically means a certain amount of friction, and a certain amount of heat generated, even if they are tiny amounts. That prevents 100% efficiency.
Because you can measure the amount of gas
What the most useful machine is, is a matter of opinion. Some would argue that the wheel is the most useful machine, and others would argue that the lever is the most useful.
The efficiency of a machine is a measure of how well it converts input energy into useful work output. It is calculated as the ratio of useful work output to the total input energy or power. A high efficiency indicates that the machine is able to minimize energy losses and perform its intended function effectively.
A machine saves you force, changes distance, and changes direction. Those are the three ways in science that why machines are useful.
Reducing friction in a machine decreases the amount of energy lost as heat, making the machine more efficient. This means that more of the input energy is converted into useful work or output, increasing the overall efficiency of the machine.