Work, Energy and Power // Class 9 Science Notes

Work, Energy and Power

work energy and power class 9,relationship between work, energy and power, work energy and power issues and arrangements

Work is characterized as the result of the power and the distance shrouded by the body toward force. Numerically,

W= F*D

The S.I unit of the work is joule.

1 joule work is characterized as how much work done to cover a distance of 1m toward force when the power of 1N is applied on the body.

 It is a scalar amount.

 Work is finished against two powers

 Neutralize the gravity.

Neutralize erosion.

 Energy

 The capacity of a body to accomplish the work is called energy.

 There are different types of energy .They are:

Substance energy:

Substance energy is put away as expected energy. This energy can be delivered by consuming the substance.

Mechanical energy:

 It is of two kinds:

Active energy: The energy moved by the moving body is called dynamic energy. It is given by

K. E =1/2 mv^2 where, m is the mass of the body

 V is the speed.

Possible energy:

 The energy moved by the body because of its position is called possible energy. It is given by P.E = mgh where m is he mass of the body ,g is speed increase because of gravity , h is the level of the body from the beginning.

Electrical energy: The energy delivered because of the progression of charge is called electrical energy .it is utilized generally in electric apparatuses.

Heat energy: It is the energy because of the movement of atom. Each particle has active energy and the amount of K.E is heat energy. Sun is the primary wellspring of intensity energy.

 Sound energy: Sound is the type of energy which is delivered because of the vibration of atom.

Light energy:

Sun is the principal wellspring of the light energy. It gives the vibe of vision. It is framed through compound, radiation, and mechanical means. Light energy can be changed over into different types of energy.

 Attractive energy:

Attractive energy is utilized to create the power. Attractive energy is delivered with the assistance of solid magnets.

Thermal power: It is the type of energy created when at least two cores joined to shape a weighty core. This interaction is called atomic response. A colossal measure of energy is delivered during this cycle.

Change of energy: Energy can nor be made nor be annihilated yet can be changed starting with one structure then onto the next structure. For example creation of power

Potential energy à motor energy à electrical energy à light energy

 Water store in dam à pivot of turbine à generator à in bulb

Power: The pace of taking care of business is called power. Its unit is joules each second or watt. Numerically, power = W/t where W= work done, t = time taken

It is the proportion of how quick the work is finished. On the off chance that 1 joule work is finished in 1 sec, it is called 1 watt.

Power is a scalar amount.