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Now that we understand the relationship between work and energy, we are ready to look at a quantity related the rate of energy transfer. She does the same amount of work, but takes a different length of time. We use the idea of power to describe the rate at which work is done. The unit watt is named after Scottish inventor and engineer James Watt 19 January - 19 August whose improvements to the steam engine were fundamental to the Industrial Revolution. A key feature of it was that it brought the engine out of the remote coal fields into factories.
Power is the rate at which work is done. Mathematically, it is computed using the following equation. The standard metric unit of power is the Watt. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time. For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower is equivalent to approximately Watts. Most machines are designed and built to do work on objects.
Work and energy