External Forces. This would break the law of conservation of energy. A car engine is an example of a machine that is given a power rating. If an electric drill uses of electrical energy each second but only does of useful work, calculate the percentage efficiency of the drill. The work done to lift her body is. 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. So, when we boil a kettle, we're losing energy in the form of sound. Unsourced material may be challenged and removed. As electricity as distributed through the National Grid, energy is lost from the transmission lines and also when it is transferred from the power stations to the lines and the lines to our homes.

Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. In a more general sense, it is the ability to do things well, successfully, and without waste.

### Efficiency ( Read ) Physics CK12 Foundation

In more mathematical or scientific terms, it is a measure of the extent to which input is of useful output to total input, which. This means that as much of the input energy as possible should be transferred into This is when both useful energy transferred and total energy supplied are. In National 4 Physics consider the 'useful' energy being transferred in a process in into unwanted forms of energy, meaning that there is less useful energy after the This equation describes the percentage of total energy output compared to the Maths · Modern Languages · Modern Studies · Music · Music Technology.

During a physics lab, Jack and Jill ran up a hill.

Jack is twice as massive as Jill; yet Jill ascends the same distance in half the time. A transformer usefully transfersW of theW of energy supplied to it.

As power is equal to useful energy transferred per second, another way to calculate efficiency is to use the formula:. The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways.

### Work, power and efficiency AQA Revision 3 GCSE Physics (Single Science) BBC Bitesize

Example The energy supplied to a light bulb is J. Finally we lose energy in our homes.

The efficiency is the energy output, divided by the energy input, and expressed. Students will learn how to calculate power and efficiency. We define efficiency as the ratio of output energy (in this case kinetic energy) to.

definitions of energy return ratios, starting with the work of Odum in the early.

## Electrical power Revision 2 National 4 Physics BBC Bitesize

an estimate of total energy inputs per unit of energy output.

Finally we lose energy in our homes. This is when both useful energy transferred and total energy supplied are measured in joules J. For other uses, see efficiency disambiguation. However some energy can be transformed into unwanted forms of energy, meaning that there is less useful energy after the change than there was before. Yet, Jill is just as "power-full" as Jack.

The tired squirrel does 0. It can also be assumed that the angle between the force of the stairs on Ben and Ben's displacement is 0 degrees.

Only a limited conversion of potential energy to kinetic energy occurs before the. Definition and Mathematics of Work · Calculating the Amount of Work Done by. Use conversion factors to show how many joules of energy you get when you. The consideration of input power CO5-math prevents this singular condition To define the regional control problem for farfield radiation, the bright zone is excitation function CO5-math, the total input energy COS-math-O fed.

How efficient is the light bulb?

Cambridge: Cambridge University Press. One horsepower is equivalent to approximately Watts.

All machines are typically described by a power rating. Devices waste energy for various reasons including friction between their moving parts, electrical resistance, and unwanted sound energy.

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Effectiveness is the simpler concept of being able to achieve a desired result, which can be expressed quantitatively but does not usually require more complicated mathematics than addition.
Read Watch Interact Physics Tutorial. Despite the diagonal motion along the staircase, it is often assumed that the horizontal motion is constant and all the force from the steps is used to elevate the student upward at a constant speed. Video: Total energy input definition math What is ENERGY INPUT LABELING? What does ENERGY INPUT LABELING mean? ENERGY INPUT LABELING meaning Finally we lose energy in our homes. Of course, since we know that. As electricity as distributed through the National Grid, energy is lost from the transmission lines and also when it is transferred from the power stations to the lines and the lines to our homes. Therefore some of the electrical power going into your computer is lost as heat and noise from the fan to the surroundings. |

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