Electrical Resistance Formula

Electrical Resistance Formula

The Electrical Resistance Formula is the amount of resistance given by a device or substance to the flow of electric current. A resistor is a type of electric component that provides the necessary resistance in a circuit. Students must examine the concept of electric resistance as well as numerous electrical resistance formulas with examples in the Extramarks website’s Electrical Resistance Formula.

When they know the length and cross-sectional area of a conductor, they can calculate its electrical resistance as the product of its resistivity and length divided by its cross-sectional area. The Electrical Resistance Formula is expressed mathematically as follows:

The Electrical Resistance Formula R= lA


R is the resistance

ρ is the resistivity of the conductor

l is the length of the conductor

A is the area of the cross-section of the conductor

The Electrical Resistance Formula is directly proportional to the length of the conductor and inversely proportional to the area of the conductor, according to the following formula. The Electrical Resistance Formula   can be better understood by using the following water pipe analogy:

When the pipe grows longer, the length increases, and the resistance to the flow of water increases.

When the pipe grows wider, the area of the pipe increases, and the resistance to the flow of water decreases.

Electrical Resistance

Resistance (also known as ohmic resistance or electrical resistance) is a measure of an electrical circuit’s resistance to current flow. Resistance is measured in ohms, which is represented by the Greek letter omega ().

The greater the resistance, the greater the impediment to current flow.

When a potential difference is applied to a conductor, current or free electrons begin to flow.The unbound electrons clash with the conductor’s atoms and molecules as they move.

Because of a collision or an obstacle, the rate of movement of electrons or electric current is limited.As a result, students may say that there is some resistance to the passage of electrons or currents. Thus, resistance refers to a substance’s opposition to the flow of electric current.

The resistance of the conducting material is discovered to be directly proportional to the material’s length and inversely proportional to the material’s cross-sectional area.

Depending on the material’s composition

It is determined by the temperature.

Concept of Electrical Resistance

Consider the following instances of metallic substances to better comprehend their notion. A metallic substance’s crystal structure has a large number of free electrons that move randomly. When one puts a voltage across the resistance caused by the electric field, the free electrons in the material migrate from a lower potential point to a higher potential point.

During this drifting motion, the free electrons clash with the substance’s atoms regularly. This phenomenon inhibits electrons from freely moving, resulting in resistance.

When an electric voltage is put across a material, an electric current flows through it. The applied voltage across the material is proportional to the electric potential. The resistance constant is a proportionality constant. As a result, resistance is a critical element in the passage of electric current in an electric circuit. Ohm’s law is used to support this.

For resistance values, the unit ohm is commonly used. Depending on the magnitude of resistance, one may also use units such as giga-ohm, mega-ohm, kilo-ohm, milli-ohm, micro-ohm, and even nano-ohm.

The Formula for Electrical Resistance

Ohm’s law may be used to compute it. The Electrical Resistance Formula is defined as the applied voltage divided by the current. Therefore,

The  Electrical Resistance Formula R = V/I


R refers to the Electrical Resistance

V is noted as the Voltage

I is cited as the Electric current

Solved Examples

Students who are well-versed in Physics fare better in competitive exams. Physics formulas are developed and tested. The primary goal of the Extramarks team is to build a solid conceptual basis. Physics is one of those subjects that requires the use of a large number of equations. A strong understanding of the Electrical Resistance Formula can help students evaluate their strengths and shortcomings. The Electrical Resistance Formula can help in exam preparation. Saving formulas might be challenging at times. Preparation with enough study materials is typically beneficial. These Extramarks solved examples have been carefully chosen to help students learn and understand the Electrical Resistance Formula. Because the language is simple enough, students may learn more and get the most out of their experience. Extramarks examples might help students improve their study habits and achieve their objectives. The Electrical Resistance Formula is critical for delivering solutions. Students should practise answering questions on the Electrical Resistance Formula. Each of them may be fully practised with the aid of Extramarks. Extramarks offers a collection of solved sample problems to help students with their studies.The Electrical Resistance Formula can help pupils improve their problem-solving abilities and adapt to challenges in competitive assessments.

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