Power time energy relationship

What is the relationship between power and energy? - Physics Stack Exchange

power time energy relationship

Power may be defined as the rate of doing work or the rate of using energy. calculates the work first and then divides by the time to get the average power. In physics we say that work is done on an object when you transfer energy to that Electrical Energy --The generation or use of electric power over a period of. It is derivable from conservation of energy and the application of the relationships for work and energy, so it is not independent of the conservation laws. It is in.

Work, Energy and Power

Sometimes, the work is done very quickly and other times the work is done rather slowly. For example, a rock climber takes an abnormally long time to elevate her body up a few meters along the side of a cliff. On the other hand, a trail hiker who selects the easier path up the mountain might elevate her body a few meters in a short amount of time.

The two people might do the same amount of work, yet the hiker does the work in considerably less time than the rock climber. The quantity that has to do with the rate at which a certain amount of work is done is known as the power. The hiker has a greater power rating than the rock climber. Power is the rate at which work is done.

power time energy relationship

Mathematically, it is computed using the following equation. As is implied by the equation for power, a unit of power is equivalent to a unit of work divided by a unit of time.

power time energy relationship

For historical reasons, the horsepower is occasionally used to describe the power delivered by a machine. One horsepower is equivalent to approximately Watts. Most machines are designed and built to do work on objects. All machines are typically described by a power rating.

power time energy relationship

The power rating indicates the rate at which that machine can do work upon other objects. A car engine is an example of a machine that is given a power rating. The power rating relates to how rapidly the car can accelerate the car.

If this were the case, then a car with four times the horsepower could do the same amount of work in one-fourth the time. The point is that for the same amount of work, power and time are inversely proportional.

The power equation suggests that a more powerful engine can do the same amount of work in less time. A person is also a machine that has a power rating.

Power (physics)

Some people are more power-full than others. When a neutron splits an atom's nucleus into smaller pieces it is called fission.

Unit 6 - Relationship Between Frequency, Energy & Wavelength

When two nuclei are joined together under millions of degrees of heat it is called fusion Electrical Energy --The generation or use of electric power over a period of time expressed in kilowatt-hours kWhmegawatt-hours NM or gigawatt-hours GWh.

Chemical Energy --Chemical energy is a form of potential energy related to the breaking and forming of chemical bonds.


It is stored in food, fuels and batteries, and is released as other forms of energy during chemical reactions. Mechanical Energy -- Energy of the moving parts of a machine. Also refers to movements in humans Heat Energy -- a form of energy that is transferred by a difference in temperature What is Power Power is the work done in a unit of time. In other words, power is a measure of how quickly work can be done.

One common unit of energy is the kilowatt-hour kWh. If we are using one kW of power, a kWh of energy will last one hour. Power's unit of measurement in the English system is the horsepower, which is equivalent to How much work is done? Please enter your answer in the space provided: How much power is used?