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what are ouput device?

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Power is the rate at which work is done.
It is the work/time ratio.
The standard metric unit of power is the Watt.

http://www.radian.com.hk/simulations/#/details/60

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An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy.

1 Gravitational potential energy
Gravitational potential energy is the energy stored in an object as the result of its vertical position or height. The energy is stored as the result of the gravitational attraction of the Earth for the object

PEgrav = mass • g • height

PEgrav = m *• g • h

2 Elastic potential energy.
Elastic potential energy is the energy stored in elastic materials as the result of their stretching or compressing. Elastic potential energy can be stored in rubber bands, bungee chords, trampolines, springs, an arrow drawn into a bow, etc. The amount of elastic potential energy stored in such a device is related to the amount of stretch of the device - the more stretch, the more stored energy

Fspring = k • x

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Kinetic energy is the energy of motion. An object that has motion

Kinetic energy is a scalar quantity

http://www.radian.com.hk/simulations/#/details/55

1 Joule = 1 kg • m2/s2

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The efficiency of a device such as a lamp can be calculated using this equation:

efficiency = ( useful energy transferred ÷ energy supplied ) × 100

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When a force acts upon an object to cause a displacement of the object, it is said that work was done upon the object

There are three key ingredients to work - force, displacement, and cause.
In order for a force to qualify as having done work on an object, there must be a displacement and the force must cause the displacement.

Mathematically, work can be expressed by the following equation.

W = F • d • cos Θ

Scenario A: A force acts rightward upon an object as it is displaced rightward. In such an instance, the force vector and the displacement vector are in the same direction. Thus, the angle between F and d is 0 degrees.

Scenario B: A force acts leftward upon an object that is displaced rightward. In such an instance, the force vector and the displacement vector are in the opposite direction. Thus, the angle between F and d is 180 degrees.

Scenario C: A force acts upward on an object as it is displaced rightward. In such an instance, the force vector and the displacement vector are at right angles to each other. Thus, the angle between F and d is 90 degrees.

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Energy can be defined as the capacity for doing work.
It may exist in a variety of forms and may be transformed from one type of energy to another. However, these energy transformations are constrained by a fundamental principle, the Conservation of Energy principle. One way to state this principle is "Energy can neither be created nor destroyed".

http://www.radian.com.hk/simulations/#/details/58