Power is defined by how quickly energy is delivered or received. The unit od measurement is the watt. It is abbreviated by a capital "W" because it is named after James Watt. It is modeled mathematically by
Since the change in energy equals the work, the formula can also be written as
This concept of power is not limited to mechanical power. Any time power is discussed, it can always be described energy over time. In the United States, an often used consumer unit of power is the horsepower. It is abbreviated by the letters hp.
Below is information found on the Ford's web site for the version of the Ford Focus that is sold in the United States. Take note of the power's units.
Below is the German version of the Ford Focus. This clip is from Ford's German web site. Note Germany's power units.
This German site posts the power in kiloWatts, (1 kW = 1000 W.)
Example Problem #1
Example Problem #2
Example Problem #3
