Blog Tag ENERGY

Law of conservation of energy

According to law of conservation of energy total energy of the universe is conserved. The energy cannot be created nor be destroyed. It can simply be converted from one form to another. Let us consider the following examples in which one form of energy converts to another. A cell or battery converts chemical energy into electric energy. A mic . . .

Sources of energy

All sources of energy divided into two groups: Conventional sources of energy. Non- Conventional sources of energy. The fuel like wood, coal and petroleum are major conventional sources of energy. Wood and coal convert chemical energy into heat energy. Petroleum converts chemical energy into mechanical energy to run automobiles. The so . . .

Different forms of Energy

SOLAR ENERGY: The energy radiated from sun is called the solar energy. Energy of sun is due to fusion of hydrogen nuclei into helium. The earth receives only a billion part of total energy from sun. Plants use solar energy to make food for themselves. This process is called photosynthesis. However, one can store this energy through solar cells. Li . . .

Energy in different forms

  . . .

Electrical energy and power

The flow of electric current in any circuit causes electric energy. Like, an electric bulb converts electrical energy into light energy, Electric fan converts electric energy into mechanical energy, Radio set converts electrical energy into sound energy. Electrical energy: We know that work done in flowing the charge q through a conductor having p . . .

Terms related to machines

Effort(E): The force applied on a machine to do some mechenical work. Load(L): The weight moved or the resistance overcome by a machine in doing some mechenical work. Fulcrum(F): A fixed point or an axil around which a machine turn i doing mechenical work. Effort arm: The perpendicular distance between the effort point and the fulcrum of a mach . . .

Principal of Lever

It states that the product of an effort with effort arm is equal to the product of load with load arm. Load x Load arm = Effort x Effort arm  . . .

Levers of the first order

In this type of levers, the fulcrum is situated between the load and the effort. The effort arm may be equal or less than or more than load arm. In case the effort arm is more than load arm, a small effort is required to more load. However, if effort arm is less than load arm, a large effort is required to move load.  Examples: Sea saw, Sci . . .

Levers of the second order

In this type of levers, the load is situated between the effort and the fulcrum. In the levers of second order, the load arm is always smaller than the effort arm. Thus always less effort is required to move a heavy load.  For examples: Nut cracker, wheel barrow, oars of a boat are levers of the second order. this lever is also called force m . . .

Levers of the third order

In this types of levers the effort is situated between the load and the fulcrum. In the levers of third order, the effort arm is always smaller than the load arm. Thus more effort is required to lift a lighter load, This lever is also called speed multiplier lever as load moves through lerger distance as compared to the effort. For examples: Sugar . . .

Pulley

Pulley is a flat circular disc having a groove in its edge and capable of rotating around a fixed point passing through its central axis commonly called axle. In a way axle is a fulcrum around which pulley rotates. . . .

Types of Pulley

Pulley consists of two types: 1. Single Fixed Pulley System: It consists of single pulley. It is attached to some high platform and around its groove passes a rope. One end of the rope is attached to the load. Effort is applied at the other end of the rope. This pulley is commonly used in drawing water from village wells.   2. Sing . . .

Functions of a Simple Machine

In most of the machines, the load is greater than the effort, However, in some machines, the load is equal to the effort or less than the effort but in such cases, the effort acts in a desired direction or at a convenient point which makes the job easy. Machine has the following two functions: 1. It changes the magnitude of the force required, i.e . . .

Simple Machines with Examples

Following are the six simple machine swhich are generally use in our daily life: 1. The lever  e.g. mango cutter, beam balance etc. 2. The pulley e.g. pulley  3. The wheel and axle e.g. door knob steering wheel etc. 4. The inclined plane  e.g. staircase, ramp etc. 5. The wedge e.g. needle, axe etc. 6. The . . .

Advantages of the Dry Cell

1. Dry cells are light in weight and small in size. 2. Dry cells can easily carried from one place to another. 3. There is no fear of leakage in the dry cells. 4. They can easily be used to run the simple electrical devices. . . .

Pages