Resistance is the amount of resistance any object applies to the flow of electric current. An electronic component called a resistor is used in a circuit to provide a certain level of resistance. Resistance is a property of materials that permits the flow of electric current. Resistance unmistakably opposes the current’s flow. Additionally, the Greek uppercase letter omega designates the resistance unit, which is the ohm. The Resistance Formula is used to measure resistance.
What is Resistance?
The quality of materials that allows electric current to flow is called resistance. Resistance to the stream’s flow is undoubtedly present. Electric current is defined as the movement of electrons.
An individual, for instance, might find it difficult to move from one store to another in a crowded market. This situation is very comparable to an electron trying to squeeze through a wire.
The Greek capital letter “omega” serves as a symbol for the resistance unit, which is “ohms.” Additionally, a resistor’s resistance is influenced by both the current flowing through it and the voltage applied across it. Resistance is a unit of measurement for the amount of resistance an electrical circuit has to current flow.
The measurement of an object’s resistance to the flow of electric current is called its electrical resistance. Electrical conductance describes how easily an electrical current can flow. Additionally, there are some parallels between mechanical friction and electric resistance. Resistors are also used in electrical circuits. All the materials restrict current flow to some degree. A measurement of an object’s resistance to the flow of electrical current is called its electrical resistance. Electrical conductance, which measures how easily an electric current moves, is its reciprocal quantity. Mechanical friction and electrical resistance have some conceptual similarities. Electrical resistance is measured in ohms in the SI, whereas electrical conductance is measured in siemens.
An object’s resistance is largely determined by the material it is made of. Electrical insulators, such as rubber, often have extremely high resistance and low conductance, whereas electrical conductors, such as metals, often have extremely low resistance and high conductance.
Resistance Formula Derivation
The Resistance Formula is important for solving questions. Students are advised to learn the Resistance Formula derivation. Each of the points given in the Resistance Formula the must be learned. By measuring conductivity or resistivity, this relationship is quantified. However, because resistance and conductance are extensive rather than intensive properties, an object’s size and shape are also important factors in these properties. For instance, the resistance of a wire increases with length and thinness and decreases with length and thickness. With the exception of superconductors, all objects have a resistance to electrical current of zero. A given object’s resistance primarily depends on two elements: the material it is made of and its shape. A thick copper wire will show less resistance than an otherwise identical thin copper wire because the resistance of a given material is inversely proportional to the cross-sectional area. Additionally, for a given material, the resistance increases with length; for instance, a long copper wire has a higher resistance than a short copper wire of the same material.
Solved Examples on Resistance Formula
All the chapters’ content needs to be learned and thoroughly revised by students. The most effective problem-solving techniques must be learned by students. Students will discover the most effective methods for responding to questions based on the Resistance Formula by using the Extramarks website and mobile application. All of the important questions involving the Resistance Formula should be practised by students. They ought to study the Resistance Formula. The Resistance Formula needs to be revised frequently. If students frequently practice the questions, they will remember the Resistance Formula more easily. They can access all the important study materials from Extramarks.