A machine is a device that is used to turn energy into useful forms. This may include heat, electricity, light, or sound.
There are several ways to measure the efficiency of a machine. The basic formula is to take the output of a machine and divide it by the input.
The output may be less than the input or it may be the other way around. This may not be a very good measure of the true efficiency of the machine.
In addition to the energy input, there is always a cost to operating the machine. This cost can come in the form of downtime, repairs, and maintenance. The amount of downtime can be due to a number of factors, including unplanned maintenance and poor operator training.
The most obvious way to measure the efficiency of a machine is to look at its power output. A good example of this is a car engine. The engine converts chemical energy stored in fuel into mechanical energy.
Another way of achieving the same feat is with an electric motor. Typical motors operate at an 85 percent efficiency rate.
The efficiency of an electric motor is measured by the ratio of mechanical power output to electrical power input. Some of the best motor designs also minimize the amount of noise and heat.
In the real world, the efficiency of a machine is usually between 0% and 100%. This is because there is always some waste or loss in the process.