Ohm’s Law Resistance and Resistors with Examples

 

Ohm’s Law Resistance and Resistors

Resistance is the difficulty applied by the conductor to the current flowing through it. Each material has different resistance. We show resistance with R and unit of it is ohm (Ω).

1 Ω=resistance of the conductor when 1 A current flows under the 1 V potential difference. Resistance is represented with the following picture in circuits;

resistance

 

Rheostat

Rheostat is a kind of device used to vary existing resistance. It is shown in the circuits as;

rheostat

 

 

Resistance of the conductor depends on;

· Types of the material or electrical resistivity of the material. It is shown with Greek letter ρ. Resistance of the material is linearly proportional to electrical resistivity.

· Length of the material (l). Resistance is linearly proportional to the length of the conductor.

· Cross sectional are of the conductor. Resistance is inversely proportional to the cross sectional area.

· Temperature. Temperature shows different effects with respect to the type of material.

We write resistance formula with the explanation given above as;

resistance

 

Ohm’s Law

Ohm’s law gives the relation between voltage, current and resistance. According to Ohm, current in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the conductor. We can summarize this explanation with following formula;

ohm's law

 

If we take resistance of the conductor constant, then potential difference and current of the system changes linearly as shown in the following graph;

ohm's law graph

 

 

 

 

 

 

 

Example: Potential difference vs. Current graph of a conductor is given below, Find the behavior of resistance in intervals I, II and III.

resistance example

 

 

 

 

 

 

Ohm’s law states that V=I.R

 

  • In the first interval, since the potential difference and current are linearly increases then resistance of the system becomes constant.
  • In the second interval, potential difference is constant however, current increases. This can be possible by decreasing in the amount of resistance.
  • In the third interval, current is constant, however, potential difference increases. This can be possible by increasing in the amount of resistance.

Electric Current Exams and Solutions

 

Related

PICTURE EXAMPLES OF RESISTORS
ohms law resistance * added formula
ohms law problems examples
current vs resistance ohms law graph
resistor temperature vs resistance
Examples of Electric Resistors
laws of resistance
example graph current against resistant
examples of how ohms law works
current density and ohms law examples through conductor
Ohms Law Formulas
ohm law formula example
numericals of resistivity
example of problem and solution about temperature resistance effect
problems and solutions about temperature resistance effect
ohm law exams
ohms law example
image of graph of ohms law
ohms law problems w/ solution
the resistance of a conductor examples
ohms law alternating current pictures
example of ohms law with solution
example of ohms picture
sample problem of ohms law resistor
ohms lawresistance and resistor
ohm law experiment involve resistor and rheostat
resistance ohms law + if we increase temperature
ohm law of newton
resistivity law
resistivity with temperature example problem with solution
ohms law example physics problem
resistors resistance example
resistance of a conductor examples
resistance in resistors
law of resistance(law of lenghts) sample problems
cheat sheets ohm law
Resistivity examples
examples of rheostat physics
coulombs law and ohms law
conductors and resistors
a rheostat of resistance and formula
ohm law summarise
law of temperature(resistance)
what is newtons ohm law
what is the effect of temperature on ohm,s law
ELECTRICAL OHM LAW
pic ohms law
sample problems of ohms law with a single resistor
electrical resistor pictures
ohms law sample computation