How are power ratings used to describe machines?

power ratings basically just compare with how many watts are used, like a tackle in football compares to a car engine

For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower is equivalent to approximately 750 Watts ... Thus, the power of a machine is the work/time ratio for that particular machine. A car engine is an example of a machine that is given a power rating.