Mechanical power is the rate at which work is done or energy is transferred in a mechanical system. It is commonly measured in watts (W), where one watt equals one joule of work done per second. Mechanical power can be calculated using the formula: Power = Work / Time, indicating how quickly work is performed. In machines, such as engines or motors, mechanical power is essential for performing tasks like lifting, moving, or rotating objects. The efficiency of these machines often depends on their mechanical power output, which can be influenced by factors like friction and load.