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Power is the rate at which work is done (or energy is transferred). What is the unit of power? Watt is the unit of power!
Power: A brief overview of power in an algebra-based physics course. Energy transfer can be used to do work, so power is also the rate at which this work is performed. The same amount of work is done when carrying a load up a flight of stairs whether the person carrying it walks or runs, but more power is expended during the running because the work is done in a shorter amount of time.
Power—the word conjures up many images: a professional football player muscling aside his opponent, a dragster roaring away from the starting line, a volcano blowing its lava into the atmosphere, or a rocket blasting off, as in Figure 1.. These images of power have in common the rapid performance of work, consistent with the scientific definition of power (P) as the rate at which work is done.
Power in Waves. Consider a sinusoidal wave on a string that is produced by a string vibrator, as shown in Figure \(\PageIndex{2}\). The string vibrator is a device that vibrates a rod up and down.
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Power Power may be defined as the rate of doing work or the rate of using energy. These two definitions are equivalent since one unit of energy must be used to do one unit of work. Often it is convenient to calculate the average power. In the straightforward cases where a constant force moves an object at constant velocity, the power is just P ...
Let's explore the meaning of power (rate of doing work) in physics. More free lessons & practice -https://www.khanacademy.org/science/in-in-class9th-physics-...
