Physics

# What is Power?

Power is the rate at which a job is done or the rate at which power is moved from one location to one more or changed from one kind to one more. In various other words, power is the rate at which a job is done. It is the work/time proportion. Mathematically, it is calculated utilizing the list below formula.

Power = Work / time;   [ P = W/t]

or, Power = (Force x Displacement)/Time;    [P = (f x d)/t]

or, Power = Force x Velocity;  [ P = f x v ]

The S.I. unit of power is the Jule/second or Watt. As is suggested by the formula for power, a unit of power amounts to a unit of job split by a unit of time. Thus, a Watt amounts to a Joule/second. The horsepower is sometimes made use of to define the power supplied by equipment. One horsepower amounts to around 746 Watts.

## Example:

A machine does 200 joules of work in 25 seconds. Find the power of the machine

we know that, power = work/time

so the power of machine = 200 Jule/25 second = 8 Jule/second = 8 watts.

Most equipment is made as well as developed to do service things. All equipment is commonly explained by a power ranking. The power ranking shows the rate at which that device can do function upon various other things. Thus, the power of the equipment is the work/time proportion for that certain device. An auto engine is an instance of equipment that is offered a power ranking. The power ranking connects to just how swiftly the cars and trucks can speed up the cars and trucks. Suppose that a 40-horsepower engine might speed up the cars and trucks from 0 mi/hr to 60 mi/hr in 16 secs. If this held true, after that an automobile with 4 times the horsepower might do the exact same quantity of operating in the quarter the moment. That is, a 160-horsepower engine might speed up the exact same cars and trucks from 0 mi/hr to 60 mi/hr in 4 secs. The factor is that for the exact same quantity of job, power, as well as time, are vice versa symmetrical. The power formula recommends that a much more effective engine can do the exact same quantity of operating in much less time.

## Differences between Energy and Power:

• The amount of work that can be done by a subject expresses its energy whereas the amount of work done by the same subject in unit time expresses its ability to do work.
• Energy or work has no relation with time whereas power is related to time.
• The unit of energy or work is Jule and the unit of power is Jule/second.

## Important Questions:

Question 1: What is power?

power is the rate at which a job is done. It is the work/time proportion. Mathematically, it is calculated utilizing the list below formula.

Power = Work / time;   [ P = W/t]

or, Power = (Force x Displacement)/Time;    [P = (f x d)/t]

or, Power = Force x Velocity;  [ P = f x v ]

Question 2: What is a watt?

Watt is the S.I. unit of power. It is equal to a Jule/second.

Question 3: What is horsepower?

A horsepower is a unit of power.

1 Horsepower = 746 watts.

Question 4: What is power ranking?

All equipment is commonly explained by a power ranking. The power ranking shows the rate at which that device can do function upon various other things. Thus, the power of the equipment is the work/time proportion for that certain device. An auto engine is an instance of equipment that is offered a power ranking. The power ranking connects to just how swiftly the cars and trucks can speed up the cars and trucks.

Question 5: What is the difference between energy and power?