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OHM ELECTRIC CIRCUIT PARAMETER

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

CONTENTS:

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

2. Ohm's Law Resistance of a conductor
3. resistivity of electrical conductors.

Ohm's law.

• We analyzed the three fundamental quantities of electric circuit elements, which are: Voltage or potential difference, electric current intensity and resistance of the electrical circuit.
  
  

The name of this Act is due to the German physicist Georg Simon Ohm (1789 - 1854), it was established that:

• The intensity of current through a conductor is directly proportional to the potential difference between the ends of the conductor and inversely proportional to the resistance which it opposes the passage of current.
  
  

Expressed mathematically:

I = V / R

This expression is derived from two others:

V = I x R

R = V / I

electrical resistance of the circuit we have said, is composed of the resistance of the circuit load (lamp) plus the reluctance of the drivers.

In the circuit of the load resistance depends the resistance of the filament of the lamp connected to the circuit.
The conductor resistance will depend on:

1. Nature of electrical conductor.


2. length.
   
3. Section.
   
4. conductor temperature.

The first three parameters are related by the expression:

R = (ro x L) / S

Where:

R = resistance of conductor. Ro

= resistivity of the material. (Greek letter)

L = length of the conductors.

S = section of the conductors.

resistivity.

• Resistivity is the specific resistance of each substance to the passage of electric current, the resistivity of the conductor varies with temperature, at temperatures higher resistivity.

The inverse of resistivity is conductivity is the ease with which drivers have to pass electric current. Just as the resistivity varies with temperature.

Table of resistivities:

The length is directly proportional to the resistance of the conductor, the greater length is greater resistance.

The section is inversely proportional to the resistance of the driver, a larger section of less resistance.

resistance as a function of temperature.

the electric conductors in the temperature range resistivity variations of the same and therefore the tensile, this phenomenon can be exploited to measure temperature with the use of resistance thermometers.


transparariencia

The below are given the temperature coefficients of some materials as well as the expression to calculate the value of a given temperature restencia-

(chop on the image)

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

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