Power Formula Physics Example

The unit for standard metric work is the Joule and the standard metric unit for time is the second so the standard metric unit for power is a Joule second defined as a Watt and abbreviated W. This formula states that the consumption of energy per unit of time is called power.

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Mathematically it is computed using the following equation.

Power formula physics example. It is usually in the interval of -1 to 1 and is dimensionless. Power of a body is defined as the rate at which the body can do the work. How much power does it use.

P power Joulesecond Watt W work Joule t time interval second Based on this equation it can be concluded that the greater the work rate the greater the power. The formula for power is mentioned below. 29052021 Power formula physics example P 19000 W P 19 kW The power required to raise the elevator was 19000 Watts which is equal to 19 kW.

A radiator working with 30V potential difference has power 180 watt. Notice how this is indifferent to the degrees of heat. This is because energy is the ability to do work.

The following diagram gives the formula for power and work done. 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. Work done W 300 J Time taken t 10 s.

It is the worktime ratio. Power Factor True Power Apparent power. The standard metric unit of power is the Watt.

If the current passing through this piece of circuit is i power spent on the first resistance. First we will see some equations to help in calculating the horsepower. An electric machine makes use of 300 J of energy to do work in 10s.

The formula for Horsepower calculation. The kinetic energy of rushing out water from a dam is used in rotating a turbine. The first equation for power is work divided by time as you can see below.

The pipe through which water is rushing is 24 meters and its speed is 12 msec. Power Work time or P W t. P W t.

The standard metric unit of power is the Watt. Lets represent it mathematically. Also in this case then we could calculate Mr.

In physics power is the amount of energy transferred or converted per unit time. P S ʃ I s dS where I s is the sound intensity and dS the element reached by the wave. Here E stands for energy in joule and t stands for time in seconds.

Z- impedance of the circuit. 29072018 Which is related to how fast a job is done. The triangle above may help you to rearrange the equation.

On the other hand the smaller the work rate the smaller the power. When a car stops 40000J of work is done by the brakes in a time of 5s. Power is a scalar quantity.

The power factor of an alternating current is defined as the ratio of the true power flowing through the circuit to the apparent power present in the circuit. 27052020 Solved Examples on Power Formula Example 1 Suppose that Mr. 28022020 P E t where E is the caloric energy provided measured in joules J.

This is the most common and basic formula of power which we come to know about very early. Power to move a dough. Assuming that whole of kinetic energy of the water is used in rotating the turbine calculate the current produced if efficiency of the dynamo is 60 and the station.

Power Work time. Work done 10. R- resistance in the circuit.

Example Find the power of the man who pushes the box 8m with a force of 15N in a. The unit of the power from the equation given above joules however we generally use the unit of power as watt. We use the equation.

X elevates his body of 80 kg up by a 20-meter stairwell in 18 seconds. Scroll down the page for more examples and solutions on how to use the formula. Describe what is meant by power.

This formula is also called the mechanical power equation. Work rate refers to the rate at which work is done. For example if we have a motor with 3000 rpm and 6 in-lbf then the horsepower can be calculated below.

Find the current passing through and resistance of the radiator. Resistance of the radiator RVi30V6A5Ω. The unit for work is the joule and time is measured in seconds.

In the International System of Units the unit of power is the watt equal to one joule per second. In older works power is sometimes called activity. Work done has the same units as energy joules.

Power fracworktime For the electric motors we can calculate the power or horsepower from the torque and speed. The Power Formula is used to compute the Power Resistance Voltage or current in an electrical circuit. Power is the rate at which work is done.

Calculate power using either energy or work done. Power equals work divided by time. 2 20 J.

Also cosΦ RZ.

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