What Is Electrical Resistance Formula

The electrical resistance of a circuit component or device is defined as the ratio of the voltage applied to the electric current which flows through it.

What is electrical resistance formula. Following is the formula of electrical resistivity. The power p in watts w is equal to the voltage v in volts v times the current i in amps a. A resistor is an electric component that is used to offer the desired resistance in a circuit. Basically the resistance of the conductor depends on some important factors such as length l of the conductor the nature of materials cross section area of the conductor and temperature of the conductor.

Electrical resistance is also known as specific electrical resistance. The si unit of electrical resistivity is ohms metre. It can be seen from the equations that the resistance can be varied by changing a variety of different parameters. Electrical resistance shares some conceptual parallels with the notion of mechanical friction.

Resistance is an electrical quantity that measures how the device or material reduces the electric current flow through it. This article discusses resistance along with the resistance formula and its derivation. R is the electrical resistance of a uniform specimen of the material measured in ohms l is the length of the piece of material measured in metres m a is the cross sectional area of the specimen measured in square metres m 2. V v i a r ω.

Calculation of resistance using ohm s law. Resistance refers to the amount that an object impedes or resists in an electric current. The resistance of an object depends in large part on the material it is made of. We will discuss the concept of electric resistance and various electrical resistance formula.

Electric resistivity is defined as the electrical resistance offered per unit length and unit cross sectional area at a specific temperature and is denoted by ρ. Electric current refers to the flow of electrons. The electrical resistance of a conductor can be calculated with ohms law when the current and the voltage drop across it is known. An easier way to explain resistance is to consider an example of a person in a crowded market struggling to go from one shop to another.

Electrical resistance is a quantity that measures the opposition offered by a device or a material to flow of electric current. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. The si unit of electrical resistance is the ohm ω while electrical conductance is measured in siemens s formerly called mho s and then represented by. R frac v i where r is the resistance of the resistor r in ohms ω.

The formula to calculate the resistance using ohm s law is given as follows. The resistance is measured in units of ohms ω.