Pete St. John
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What is power in physics?
What is the unit of power?
What does power mean?
What is average power?
Learn about power as the rate of doing work, and how to calculate it using the formula P = W / t. Find out the unit of power, watt, and the difference between instantaneous and average power with examples and FAQs.
- 67 min
- 1486
It is a measure of the rate at which work is done (or similarly, at which energy is transferred). The ability to accurately measure power was one of the key abilities which allowed early engineers to develop the steam engines which drove the industrial revolution.
- V= instantaneous velocity; Since acceleration and velocity are in the same equation, then the velocity is changing (accelerating) over time, so it...
- If you know how much energy is being converted per unit time, that is all you need to calculate power. Ex. measure the current from the battery in...
- Vinitial is 0, therefore it is 1/2Vfinal
- Hello Alex, In general I would agree. In both cases you end up with joules / time. Watch out for context. It seems each field of study has it's own...
- Area under a power vs. time graph is the equivalent of integrating power with respect to time, which gives work or change in energy. To find averag...
- This is actually a very good way to think about it. Its good to know equations sometimes, but you just solved a rather tricky problem in a very ele...
In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. Power is a scalar quantity.
May 1, 2024 · Power is a function of Work done, therefore if a person works at a variable rate depending on the time of day, his power will likewise vary. Let’s learn about Power, average power, units of power, and others in this Article.
- 4 min
In physics, power is defined as the rate at which work is done. In other words, it measures how quickly energy is being transferred or transformed. Explore the concept of power in physics through an example of two weightlifters, one who lifts faster than the other, to see that power measures the rate at which work is done.
- 6 min
- David SantoPietro
- Well I might be wrong, but I don't understand very well that relation you have done. Firstly, _instantaneous_ power is equal to F · v. If we said t...
- Yes, unless the force is along the axis of displacement. (In other words, say you're pushing an object rightward on a flat surface and it moves to...
- Hi, power can also be defined as P=Fv, the work would be the same as long as the forces acting on the object are conservative, e.g. gravitational f...
- If the object is lifted faster, the lifter either has to exert more negative work to stop the object at the top, or exert less work after the initi...
- depends on the situation. But, in general, it is not an equation for average power. if, for example, during a certain time period, the velocity or...
- With multiple forces you usually use Net Force which is basically the vector sum of all of the forces.
- To quickly answer your question, the derivative unit of N*m (Joule) would be a N*m/s, which can be simplified as a Joule/s or, simply, a Watt. Abov...
Learn the various meanings and uses of the word power as a noun, verb, and adjective. Find synonyms, examples, etymology, and related phrases for power.
Jun 29, 2024 · Power is the rate of doing an activity or work in the minimum possible time. It is the amount of energy transferred or converted per unit time where large power means a large amount of work or energy. For example, when a powerful car accelerates speedily, it does a large amount of work which means it exhausts large amounts of fuel in a short time.
