# What is work and power?

Work is defined as the process of energy transfer to the motion of an object through the application of force. This is usually represented as the product of force and displacement. The SI unit of work is Joule. Power is defined as the amount of energy transferred in unit time. The SI unit of power is the watt.

## What is the work and power formula?

Power is equal to work divided by time. In this example, P = 9000 J / 60 s = 150 W . You can also use our power calculator to find work – simply insert the values of power and time.

## What is meant by work physics?

work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.

## What is the difference between work and energy in physics?

Energy deals with the capacity of an object to do the work. The SI unit of physics is joules. Work is the ability to supply force and a change in distance to an object. Energy is the ability to supply or create work.

## What is the SI unit for power?

The SI unit of power is the watt (W), in honor of Scottish inventor James Watt (1736 – 1819).

## What is power explain?

We can define power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines is given in terms of Horsepower (hp), which is approximately equal to 745.7 watts.

## What is the unit of work?

The SI unit of work is joule (J). Joule is defined as the work done by a force of one newton causing a displacement of one meter. Sometimes, newton-metre (N-m) is also used for measuring work.

## What is power example?

Power is defined as the ability to act or have influence over others. An example of power is the strength needed to run five miles. An example of power is the authority a local government has to collect taxes.

• P = E t.
• P = W t.
• P = V 2 R.

## What is a simple definition of work?

Definition of work (Entry 2 of 3) 1 : activity in which one exerts strength or faculties to do or perform something: a : activity that a person engages in regularly to earn a livelihood people looking for work. b : a specific task, duty, function, or assignment often being a part or phase of some larger activity.

## Is work scalar or vector?

Work has only a magnitude but no direction. The formula for work is written as a dot product of force and displacement. Therefore, work is a scalar quantity.

## How are work and power related?

Power is the rate at which work is done. In this case, rate means per unit of time. Power is calculated by dividing the work done by the time it took to do the work.

## What is energy formula?

Energy is defined as the capacity to do work. Formula. The energy stored in an object due to its position and height is known as potential energy and is given by the formula: P.E. = mgh. Unit.

## What is difference between work energy and power?

Work is referred to as the displacement of an object when a force (push or pull) is applied to it while energy is referred to as the capacity to do the work. It exists in various forms like potential, kinetic, chemical, thermal, nuclear, electrical energy and so on. Power is the work done per unit of time.

## How do you study work energy and power?

1. Understand the force. The first approach in work power energy problems is to master the lessons of Newton’s law of motions and have an idea about conservative and non-conservative forces.
2. Keep the system in mind.
3. Balance it out.
4. Count the variables.
5. Learn from the past.

## Which unit is joule?

4.1. The SI unit for work and energy commonly used in drawing is the joule (J), which is equivalent to a force of one newton exerted through a distance of one meter (m).

## What is a watt equal to?

Watts are defined as 1 Watt = 1 Joule per second (1W = 1 J/s) which means that 1 kW = 1000 J/s. A Watt is the amount of energy (in Joules) that an electrical device (such as a light) is burning per second that it’s running. So a 60W bulb is burning 60 Joules of energy every second you have it turned on.

## What is Ke formula?

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity: K.E. = 1/2 m v2. If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

## What is power definition in physics?

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.

## What are the 4 types of power?

• Expert: power derived from knowledge or skill.
• Referent: power derived from a sense of identification others feel toward you.
• Reward: power derived from an ability to reward others.
• Coercive: power derived from fear of punishment by others.

• Legitimate.
• Reward.
• Expert.
• Referent.
• Coercive.

## What is an example of work?

Work is force applied over distance. Examples of work include lifting an object against the Earth’s gravitation, driving a car up a hill, and pulling down a captive helium balloon. Work is a mechanical manifestation of energy. The standard unit of work is the joule (J), equivalent to a newton – meter (N · m).

## What is current formula?

Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm’s law is I = V/R.

## How is power used in physics?

In physics, power is used to describe the rate at which energy is used. In other words, it is a measurement of how fast you are using energy. Whether you run up a flight of stairs in 5 seconds or take a slow walk up the same flight in 40 seconds, you are doing the same amount of work.

## What is Ohm’s law rule?

Ohm’s Law Equation : V = IR, where V is the voltage across the conductor, I is the current flowing through the conductor and R is the resistance provided by the conductor to the flow of current.