The formula is P = E/t, where P means power, E means energy, and t means time in seconds.
There is yet another formula, which is called mechanical power equation, or simply power equation. Here, R is for Resistance, V is for potential difference, and l is for current. Ohm’s law also has a variant, which goes like P = r × l2 or V2/ R, this is the formula for the electric power. In the formula, P = VI, p stands for power, V stands for potential difference, and I stands for current. The formula goes P = VI, and it is given in the electricity chapter of the book.
There is one formula of the power called “Ohm’s law”, named after the scientist who gave this formula. This is the general idea of power, there are many instances in which the power formula changes. In simple terms, the power of anything can be obtained from dividing the work that the object has done by the time the object has taken to do that work. And with the knowledge of the work efficiency of someone or something, we can also make some good judgments and decisions regarding the same. It is simply because x has more power than y.įrom the given example it can also be understood how the power can help in determining how much work is done, and at what time it has been done. It means that the “x” is more efficient than the “y”. For instance, if x and y are doing the same task and x completes in 4 hours, while y completes the same task in 6 hours.
It helps in determining which object is more efficient and which object is less efficient. The power formula helps in determining the work done by a particular object or a person at a particular time. The power formula serves many purposes, such as: Also, this power can be in some other form as well, such as physical, or human resources. Hence, electricity is the power for such devices. Similarly, if there is no electricity in the home, the fan cannot work. For instance, many devices such as mobile phones, computers, fans, etc work on electricity, if we do not charge the battery of our phone, then it is going to be switched off. Here, the word power is used to address anything which provides the necessary force or the energy to the thing to work properly. We express the relation between work done and the time interval involved in doing it, by introducing the concept of power.Most of the things around us require some power for working efficiently. In the chapter-opening figure, several sprinters may have achieved the same velocity at the finish, and therefore did the same amount of work, but the winner of the race did it in the least amount of time. None of these quantities or relations involves time explicitly, yet we know that the time available to accomplish a particular amount of work is frequently just as important to us as the amount itself. The concept of work involves force and displacement the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory.
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