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The SI or metric system has only 7 base units, and all the other units are derived from these base units. To define units of power let us look into how the SI system works. Now we know that velocity = distance/time hence: Since Work = force * distance and power = work time, then power = force * distance time. We could derive another formula for power from the formula for work. Power = V * I, where V is the voltage within the circuit, and I is the current through the circuit. While studying electricity, you would find the power is defined as: Power is the rate at which energy (heat and electrical) is transferred. the time taken to complete a work gives the power of an entity. Power is the ratio of work and time, i.e. The word “power” is also used differently by physicists. In Physics, work done is given by force applied on an object to move a distance (d), and its formula is:Įven after applying a lot of force, if an object does not move, then in the eyes of a physicist, no work is done. The word “work” has a different meaning in the world of Physics. We will look into a few concepts around power, work, and energy in this article and discuss the unit of power in si unit and provide you with units of power list in different measurement systems. So we see it is the power that has to do with the rate at which work is done.

Here we can say that the bodybuilder has a higher power rating than the sixth-grader. If a bodybuilder and a sixth-grader carry a weight of 10 kgs up a flight of stairs, then the bodybuilder would most likely take less time than the sixth-grader to finish the same job. Sometimes the work is done quickly, and other times it might be slow and take longer.

Work done is not determined by the amount of time the force took to cause the displacement. In Physics, work is done when a force acting on an object results in its displacement.