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ELECTRIC POWER CIRCUIT

José García Coleto jogarcol@yahoo.es
http://coleto-automatismosyautomatas.blogspot.com/

QUESTIONS:

INTRODUCTION - FIGURES IN THE ELECTRICAL CIRCUIT ELEMENTARY - OHM'S LAW - ACTION ON ELECTRIC circuits is ELEMENTAL. - ELECTRIC POWER CIRCUIT ELEMENTAL . - POWER. - ISSUES. - SCHEMES BASIC FACILITIES - BASIC FACILITIES SCHEME (II) - CHARACTERISTICS OF CIRCUITS IN HOUSING.

ELECTRIC POWER CIRCUIT ELEMENTAL.

• Power is the amount of work done in unit time.

work in classical mechanics, is the product of force and the distance traveled and the cosine of the angle between two vector quantities together.

work is also called the energy used to deform or move a body overcome a resistance or acceleration or, more generally, to alter the energy of any physical system. The concept of work is tied closely to the concept of energy, both quantities measured in the same unit: the joule (joule in English).
To move the mass m from the point 1 to the point 2 we must apply a force F .

The product of the force applied multiplied by the distance between points 1 and 2 (L) is what is called work.

W = F x L

In electricity electric power is given by the expression:

P = V x I

Its unit is the watt. (W) Multiples

kilowatt (kW) Megawatt (MW)

W = 1,000 1Kw

1MW = 1,000,000 W

also
power is usually expressed in horsepower.

1HP = 736 w

shall see later that this expression is only valid when dealing with DC circuits and AC circuits but their load is completely resistive.

useful energy and lost energy.

to click on the image
I raised in the previous slide is consecuciencia the second law of thermodynamics " energy transformation across degradation occurs in the same, transforming this into heat ."

From there the concept of useful energy and energy loss.


Energy useful. Is that to actually we took advantage, ie transfomer is that in obtaining the desired effect. Its value is always, always be less than the total energy put into play.


Energy absorbed. is one that really bring to obtain the desired effect, some of this energy is not utilized but is necessary to provide for desired.


Performance. transperent The above shows that the NEXT CAT is "the relationship between what we desire and what we need to make to get the desired"

According to the second law of thermodynamics always yield less than one.

All the above can be referred to the power instead of energy all the above still valid until now.

José García Coleto jogarcol@yahoo.es
http://coleto-automatismosyautomatas.blogspot.com/

Application example:

Suppose you are feeding an electric motor through an AC line which " is the energy that has occurred?

1 .- Heating of water to vapor state at a given pressure.

• For water vapor containing a given energy due to pressure has been to require an amount of heat greater than what we have to convey, this is due to transfer losses heat, evaporation of water in the fuel, etc.
  

2 .- Transfer of the energy contained in the steam turbine driving the electric generator.

• This transfer of energy, energy that is obtained is less than that contained water vapor, for various reasons, one of them is that to produce the rotation of the turbine there is a rub on their bodies Mobile resulting in a loss of energy.

3 .- Transfer of mechanical energy turbine electric generator.

• The energy got the steam turbine to yield to the break again when passes from the turbine to the generator and returning to see a series of losses, including: lost to friction losses in the magnetic circuits of the generator, etc..

4 .- Raising the output voltage of the generator for the transport of electricity.

• The electric energy is necessary to transport a high voltage value for which you use converters, these converters the energy that enters them is less than that out of them. Although stationary machines have lost power in the magnetic circuit.

5 .- Transportation of electricity.

In transport
• of electric power is a loss of power in the transport drivers.

6 .- Reduction of transport stress on the voltage.

• Once you reach the centers of consumption is reduced again by using the voltage transformer so that it becomes to produce a new energy loss.

7 .- Transport in low voltage to the point of consumption.

• processing centers since the low voltage occurs transportation to places of consumption and therefore will produce a loss of power in the conductor.

8 .- Conversion of electrical energy into mechanical energy obtained from the motor shaft.

• In this transformation occur due to friction losses and the magnetic circuit of the motor.

Clik on the image.

As we can see the simple fact of activating a mecanimo to start a machine has a series of energy transformations in any case mean that the energy that really get much lower than we bring in the origin of the process .

José García Coleto jogarcol@yahoo.es
http://coleto-automatismosyautomatas.blogspot.com/

INTRODUCTION - FIGURES IN THE CIRCUIT ELEMENTARY ELECTRICAL - OHM'S LAW - ACTION ON ELECTRIC circuits is ELEMENTAL. - ELECTRIC POWER CIRCUIT ELEMENTAL . - POWER.