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      What are Resistors?

      What are Resistors or Resistance Introduction Resistors are two-terminal devices that are used to control the passage of current, to put it simply. Understanding the

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What is Resistance

What are Resistors or Resistance

Introduction

Resistors are two-terminal devices that are used to control the passage of current, to put it simply. Understanding the concept of electricity is required to grasp the concept of resistors. In what way is electricity produced? To fully visualize this idea, let’s examine at a length of wire that contains electrons, which are subatomic particles with negative charges that can move about freely. When a voltage or potential difference is applied between the cable’s endpoints. The electrons must travel or else. Electric current is the name for this motion. Although the electrons can travel through the wire, there is a resistance that prevents the electrons from doing so easily. This is electrical resistance, and the Ohm is the unit of measurement. 

Mr. OHMS

The OHMS gets its name from the German physicist Georg Simon Ohm, who noticed that the potential difference across a conductor and the electric current are directly proportional. In reality, we may claim that humans are a resistor because our bodies can conduct electricity. Even so, the resistance in these two circuits is the same. Of the two possibilities, one is obviously more practical to implement. Each one has a coefficient of resistance, which is one of its primary features. These themes will be covered in length in subsequent content.

Index

Resistance and its Types

  • Fixed Value Resistors


  • Variable Resistors.

  • Resistor Networks.
  • Carbon Film Resistors.
  • Metal Film Resistors.
  • Wire wound Resistors.
  • Metal Oxide Resistors.
  • Metal Strip Resistors.

Factors Affecting Resistance

Four major factors influence resistance: The kind of material used (coefficient of resistance) to create the resistor, resistor’s length, area of cross-section, and conductor’s temperature. let’s go over each in greater depth.

  • Coefficient of Resistance: There are several classes based on this coefficient of resistance that is in fact defined by the material. A substance is said to as a conductor if it has a low coefficient of resistance, like copper or gold. On the other hand, if it has a greater coefficient, insulating elements like glass or plastic are considered to be present. However, there are also materials with intermediate properties, which are referred to as semiconductors. These materials can occasionally change their conductivity depending on outside factors.
  • Length of Wire: The resistance of a conductor is directly proportional to its length (L) as R ∝ L. It implies that when we lengthen the resistor, resistance will grow as well. The resistance will increase as the length increases. The number of collisions that take place when the electrons go from one end of the wire to the other increases with the length of the wire. The resistance is raised as a result.
  • Area of Cross-section: A conductor’s resistance is inversely related to its cross-sectional area (A). The probability of collisions simply decreases as the resistor’s cross-sectional area increases: The resistance decreases as the number of collisions decreases.
  • Temperature: Resistance is directly proportional to temperature. The ions in a metal conductor vibrate more rapidly as their temperature rises. As a result, there are more collisions between the ions and free electrons. Therefore, resistance rises as temperature rises for a metal. It is not true for all materials.

The Resistivity of various Materials

  • Conductor: Materials with exceptionally low electron flow resistance are called conductors. Copper and aluminum, for instance, have low resistance. Less resistance is seen in good conductors.
 
  • Semiconductor: Semiconductors are substances with a reasonable resistance (not extremely high or extremely low) at room temperature. Semiconductors can be used to create various electronic gadgets. Because they permit only partial electron motions, silicon and germanium are the two materials most frequently employed for semiconductors.
 
  • Insulators: The resistivity is high for insulators because it is a bad conductor. Glass prevents the flow of electrons. It has a high resistance as a result. These materials are primarily utilized in electric systems to stop leakage current while being extremely poor electrical conductors.

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What are Resistors?

What are Resistors or Resistance Introduction Resistors are two-terminal devices that are used to control the passage of current, to put it simply. Understanding

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