Now, let us have look at major work and power difference:. Work refers to the amount of energy required to displace an object from one place to another. Power of the body refers to the energy consumed by the object to displace from one position to another.
Work is defined as the work done by an object is equal to the scalar product of force and displacement. Mathematically we write:. F - The external force exerted on the object. S - The displacement of the body. The power of a source is defined as the rate of doing work. Mathematically, we write:.
The SI unit of work is given by Joules and it is denoted by J. The SI unit of power is the watt and it is denoted by W. Work is the most frequently used concept in our regular living. Power is a comparatively less used concept but is of the same importance. Work is independent of time. Power is a time-dependent quantity. The factors that affect the work done by an object is:. Force exerted on the body. Its SI unit is the Joule J.
Ex: when an object is rotated by an external torque , when a gas is compressed or expanded, when a body is moved by an external force acting on it. The work done by an external force acting on a body can be defined as the integral of the scalar product of the force and the displacement caused by that force. This work done W can be computed using the equation,. The work done by an external torque acting on a body can be defined as the integral of the scalar product of the torque and the angular displacement caused by that torque.
This work done W can be expressed as,. When we deal with small energy values, eV is used as the unit. It is equal to the work done, on an electron when it is accelerated through a potential difference of 1V. Written by : Ben Joan. User assumes all risk of use, damage, or injury.
You agree that we have no liability for any damages. Summary: 1. Author Recent Posts. Ben Joan. Latest posts by Ben Joan see all. Help us improve. Rate this post! Rahul Pal B. The SI unit of power is Watt W. In case of machines or motor vehicles the SI unit is different which is given the term horsepower hp.
Watt can be seen in daily life as a unit of electricity as well. Which implies that electricity which is a form of power is used. Power decides how quickly work could be done, it is interlinked with work. But power is more used in regular life when compared to work. Power refers to the rate at which work can be done, it can be slow or fast. Power is determined by two factors: work and time.
Power is defined as the rate of energy spent, so when power is calculated it is dependent on the work and time taken to accomplish it. There is average power which signifies the energy consumed divided by the total time taken.
Average amount of work done or energy converted per unit of time. Power can be calculated in physics by using formula which is;.
0コメント