Home Random Page



Условно придаточные предложения в тексте отсутствуют.


The two conductors A and A' are connected in series to form a turn, the front end of the conductor A being con­sidered as the front end of the turn, and the front end of the conductor A' being considered as the rear end.

In practice it is usual to arrange the armature conductors on the stationary element of the machine, now called the stator, the d. c. ex­cited field forming the rotating element, or rotor.

Each winding also is made to consist of many turns.

It re-introduces the fourth conductor to act as a common return for the three singlephase loads, this conductor being called the neutral.

Colour Scheme - for purposes of standardization it is now the general practice to mark each particular phase by a distinctive colour.



1. In physics, energyis a property of objects, transferable among the fundamental interactions, which can be converted into different forms but not created or destroyed. The joule is the SI unit of energy, based on the amount transferred to an object by the mechanical work of moving it 1 metre against a force of 1 newton.

2. In electrical engineering, an armature generally refers to one of the two principal electrical components of an electromechanical orelectrical machine — generally in a motor or generator — but it may also mean the pole piece of a permanent magnet or electromagnet, or the moving iron part of a solenoid or relay.

3.Phase in sinusoidal functions or in waves has two different, but closely related, meanings. One is the initial angle of a sinusoidal function at its origin and is sometimes called phase offset or phase difference. Another usage is the fraction of the wave cycle that has elapsed relative to the origin.

4. Electrical conductor, an object, substance or material allowing the flow of an electric charge.

5. In electricity generation, a generator is a device that converts mechanical energy to electrical energy for use in an external circuit. The source of mechanical energy may vary widely from a hand crank to an internal combustion engine. Generators provide nearly all of the power for electric power grids.

6. An atom is the smallest unit of matter that defines the chemical elements. Every solid, liquid, gas, and plasma is made up of neutral or ionized atoms. Atoms are very small: the size of atoms is measured in picometers – trillionths (10−12) of a meter.

7.A magnetism a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.

8.Electricity is the set of physical phenomena associated with the presence and flow of electric charge. Electricity gives a wide variety of well-known effects, such as lightning, static electricity, electromagnetic induction and electrical current. In addition, electricity permits the creation and reception of electromagnetic radiation such as radio waves.

9. Electromotive force, also called emf, is the voltage developed by any source of electrical energy such as a battery or dynamo. It is generally defined as the electrical potential for a source in a circuit. A device that supplies electrical energy is called a seat of electromotive force or emf. Emfs convert chemical, mechanical, and other forms of energy into electrical energy.The product of such a device is also known as emf.

10. An electron travelling through the wires and loads of the external circuit encounters resistance. Resistanceis the hindrance to the flow of charge. For an electron, the journey from terminal to terminal is not a direct route.

Date: 2016-04-22; view: 928

<== previous page | next page ==>
IV. QUALIFICATION PROCESS | The clever little bird
doclecture.net - lectures - 2014-2020 year. Copyright infringement or personal data (0.002 sec.)