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The comparison of a machines work output with its work input represented as a ratio is called the efficiency of the machine. In the real world this ratio can never be 1. The reason is that whatever work is input to the machine cannot be converted entirely to output. There are losses due to friction, heat generation and dissipation, air resistance etc. If we could have a machine with an efficiency of 1, we can have perpetual motion. That means that you drive a car up to say 65 mph on the highway and then turn off the engine, you will be going on the highway forever without spending another dime for gas. Turbines in power plants would just have to be started and brought to operating speed and from then on they will run forever.

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